creocore: change waive functionality to support waive of interest only.

mifosng-provider/src/main/java/org/mifosng/platform/api/LoansApiResource.java

@@ -40,6 +40,7 @@ import org.mifosng.platform.api.data.LoanPermissionData;
 import org.mifosng.platform.api.data.LoanProductLookup;
 import org.mifosng.platform.api.data.LoanRepaymentTransactionData;
 import org.mifosng.platform.api.data.LoanTransactionData;
+import org.mifosng.platform.api.data.LoanTransactionNewData;
 import org.mifosng.platform.api.data.MoneyData;
 import org.mifosng.platform.api.data.StaffData;
 import org.mifosng.platform.api.data.TransactionProcessingStrategyData;
@@ -414,9 +415,9 @@ public class LoansApiResource {
 			EntityIdentifier identifier = this.loanWritePlatformService
 					.makeLoanRepayment(command);
 			response = Response.ok().entity(identifier).build();
-		} else if (is(commandParam, "waiver")) {
+		} else if (is(commandParam, "waiveinterest")) {
 			EntityIdentifier identifier = this.loanWritePlatformService
-					.waiveLoanAmount(command);
+					.waiveInterestOnLoan(command);
 			response = Response.ok().entity(identifier).build();
 		}
 
@@ -436,26 +437,34 @@ public class LoansApiResource {
 			@QueryParam("command") final String commandParam,
 			@Context final UriInfo uriInfo) {
 		
-		Set<String> typicalResponseParameters = new HashSet<String>(
-				Arrays.asList("id", "transactionType", "date", "principal", "interest", "total", "totalWaived", "overpaid")
-				);
-		
-		Set<String> responseParameters = ApiParameterHelper.extractFieldsForResponseIfProvided(uriInfo.getQueryParameters());
-		if (responseParameters.isEmpty()) {
-			responseParameters.addAll(typicalResponseParameters);
-		}
-		boolean prettyPrint = ApiParameterHelper.prettyPrint(uriInfo.getQueryParameters());
-		
 		LoanTransactionData transactionData = null;
 		if (is(commandParam, "repayment")) {
+			Set<String> typicalResponseParameters = new HashSet<String>(
+					Arrays.asList("id", "transactionType", "date", "principal", "interest", "total", "totalWaived", "overpaid")
+					);
+			
+			Set<String> responseParameters = ApiParameterHelper.extractFieldsForResponseIfProvided(uriInfo.getQueryParameters());
+			if (responseParameters.isEmpty()) {
+				responseParameters.addAll(typicalResponseParameters);
+			}
+			boolean prettyPrint = ApiParameterHelper.prettyPrint(uriInfo.getQueryParameters());
 			transactionData = this.loanReadPlatformService.retrieveNewLoanRepaymentDetails(loanId);
-		} else if (is(commandParam, "waiver")) {
-			transactionData = this.loanReadPlatformService.retrieveNewLoanWaiverDetails(loanId);
+			return this.apiJsonSerializerService.serializeLoanTransactionDataToJson(prettyPrint, responseParameters, transactionData);
+		} else if (is(commandParam, "waiveinterest")) {
+			
+			final Set<String> typicalResponseParameters = new HashSet<String>(Arrays.asList("id", "type", "date", "currency", "amount"));
+			
+			Set<String> responseParameters = ApiParameterHelper.extractFieldsForResponseIfProvided(uriInfo.getQueryParameters());
+			if (responseParameters.isEmpty()) {
+				responseParameters.addAll(typicalResponseParameters);
+			}
+			boolean prettyPrint = ApiParameterHelper.prettyPrint(uriInfo.getQueryParameters());
+			
+			LoanTransactionNewData newTransactionData = this.loanReadPlatformService.retrieveNewLoanWaiveInterestDetails(loanId);
+			return this.apiJsonSerializerService.serializeLoanTransactionDataToJson(prettyPrint, responseParameters, newTransactionData);
 		} else {
 			throw new UnrecognizedQueryParamException("command", commandParam);
 		}
-
-		return this.apiJsonSerializerService.serializeLoanTransactionDataToJson(prettyPrint, responseParameters, transactionData);
 	}
 
 	@GET

mifosng-provider/src/main/java/org/mifosng/platform/api/data/LoanTransactionNewData.java

@@ -0,0 +1,37 @@
+package org.mifosng.platform.api.data;
+
+import java.math.BigDecimal;
+
+import org.joda.time.LocalDate;
+
+/**
+ * Immutable data object representing a loan transaction.
+ */
+public class LoanTransactionNewData {
+
+	@SuppressWarnings("unused")
+	private Long id;
+	
+	@SuppressWarnings("unused")
+	private EnumOptionData type;
+	
+	@SuppressWarnings("unused")
+	private LocalDate date;
+	
+	@SuppressWarnings("unused")
+	private CurrencyData currency;
+	
+	@SuppressWarnings("unused")
+	private BigDecimal amount;
+	
+	public LoanTransactionNewData(
+			final EnumOptionData transactionsType, 
+			final CurrencyData currency,
+			final LocalDate date, 
+			final BigDecimal amount) {
+		this.type = transactionsType;
+		this.currency = currency;
+		this.date = date;
+		this.amount = amount;
+	}
+}

mifosng-provider/src/main/java/org/mifosng/platform/api/infrastructure/ApiJsonSerializerService.java

@@ -23,6 +23,7 @@ import org.mifosng.platform.api.data.LoanAccountData;
 import org.mifosng.platform.api.data.LoanChargeData;
 import org.mifosng.platform.api.data.LoanProductData;
 import org.mifosng.platform.api.data.LoanTransactionData;
+import org.mifosng.platform.api.data.LoanTransactionNewData;
 import org.mifosng.platform.api.data.NoteData;
 import org.mifosng.platform.api.data.OfficeData;
 import org.mifosng.platform.api.data.OfficeTransactionData;
@@ -102,6 +103,8 @@ public interface ApiJsonSerializerService {
 	String serializeLoanAccountDataToJson(boolean prettyPrint, Set<String> responseParameters, LoanAccountData loanAccount);
 
 	String serializeLoanTransactionDataToJson(boolean prettyPrint, Set<String> responseParameters, LoanTransactionData transaction);
+	
+	String serializeLoanTransactionDataToJson(boolean prettyPrint, Set<String> responseParameters, LoanTransactionNewData newTransactionData);
 
 	String serializeChargeDataToJson(boolean prettyPrint, Set<String> responseParameters, Collection<ChargeData> charges);
 

mifosng-provider/src/main/java/org/mifosng/platform/api/infrastructure/GoogleGsonApiJsonSerializerService.java

@@ -25,6 +25,7 @@ import org.mifosng.platform.api.data.LoanAccountData;
 import org.mifosng.platform.api.data.LoanChargeData;
 import org.mifosng.platform.api.data.LoanProductData;
 import org.mifosng.platform.api.data.LoanTransactionData;
+import org.mifosng.platform.api.data.LoanTransactionNewData;
 import org.mifosng.platform.api.data.NoteData;
 import org.mifosng.platform.api.data.OfficeData;
 import org.mifosng.platform.api.data.OfficeTransactionData;
@@ -174,6 +175,9 @@ public class GoogleGsonApiJsonSerializerService implements ApiJsonSerializerServ
 	private static final Set<String> LOAN_TRANSACTION_DATA_PARAMETERS = new HashSet<String>(
 			Arrays.asList("id", "transactionType", "date", "principal",
 					"interest", "total", "totalWaived", "overpaid"));
+	
+	private static final Set<String> LOAN_TRANSACTION_NEW_DATA_PARAMETERS = new HashSet<String>(
+			Arrays.asList("id", "type", "date", "currency", "amount"));
 
 	private static final Set<String> CHARGES_DATA_PARAMETERS = new HashSet<String>(
 			Arrays.asList("id", "name", "amount", "currency", "active",
@@ -552,6 +556,17 @@ public class GoogleGsonApiJsonSerializerService implements ApiJsonSerializerServ
 						responseParameters);
 		return helper.serializedJsonFrom(gsonDeserializer, transaction);
 	}
+	
+	@Override
+	public String serializeLoanTransactionDataToJson(final boolean prettyPrint,
+			final Set<String> responseParameters,
+			final LoanTransactionNewData transaction) {
+		final Gson gsonDeserializer = helper
+				.createGsonBuilderWithParameterExclusionSerializationStrategy(
+						LOAN_TRANSACTION_NEW_DATA_PARAMETERS, prettyPrint,
+						responseParameters);
+		return helper.serializedJsonFrom(gsonDeserializer, transaction);
+	}
 
 	@Override
 	public String serializeChargeDataToJson(final boolean prettyPrint,

mifosng-provider/src/main/java/org/mifosng/platform/loan/domain/AdhikarLoanRepaymentScheduleTransactionProcessor.java

@@ -55,7 +55,6 @@ public class AdhikarLoanRepaymentScheduleTransactionProcessor extends AbstractLo
 	 * For late repayments, pay off in the same way as on-time payments,
 	 * interest first then principal.
 	 */
-	@SuppressWarnings("unused")
 	@Override
 	protected Money handleTransactionThatIsALateRepaymentOfInstallment(
 			final LoanRepaymentScheduleInstallment currentInstallment,
@@ -64,37 +63,47 @@ public class AdhikarLoanRepaymentScheduleTransactionProcessor extends AbstractLo
 			final Money transactionAmountUnprocessed) {
 		
 		// pay of overdue and current interest due given transaction date
-		MonetaryCurrency currency = transactionAmountUnprocessed.getCurrency();
+		final MonetaryCurrency currency = transactionAmountUnprocessed.getCurrency();
 		Money transactionAmountRemaining = transactionAmountUnprocessed;
+		Money interestWaivedPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		Money chargesPortion = Money.zero(transactionAmountRemaining.getCurrency());
 		
-		LoanRepaymentScheduleInstallment currentInstallmentBasedOnTransactionDate = nearestInstallment(loanTransaction.getTransactionDate(), installments);
+		if (loanTransaction.isWaiver()) {
+			interestWaivedPortion = currentInstallment.waiveInterestComponent(transactionAmountRemaining);
+			transactionAmountRemaining = transactionAmountRemaining.minus(interestWaivedPortion);
+			
+			final Money principalPortion = Money.zero(transactionAmountRemaining.getCurrency());
+			final Money interestPortion = Money.zero(transactionAmountRemaining.getCurrency());
+			loanTransaction.updateComponents(principalPortion, interestPortion, interestWaivedPortion, chargesPortion);
+		} else {
 		
-		for (LoanRepaymentScheduleInstallment installment : installments) {
-			if (
-				installment.isInterestDue(currency) && 
-				(installment.isOverdueOn(loanTransaction.getTransactionDate()) || installment.getInstallmentNumber().equals(currentInstallmentBasedOnTransactionDate.getInstallmentNumber()))
-			   ) {	
-				Money interestPortion = installment.payInterestComponent(transactionAmountRemaining);
-				transactionAmountRemaining = transactionAmountRemaining.minus(interestPortion);
-				
-				Money principalPortion = Money.zero(currency);
-				Money interestWaivedPortion = Money.zero(currency);
-				loanTransaction.updateComponents(principalPortion, interestPortion, interestWaivedPortion, Money.zero(transactionAmountRemaining.getCurrency()));
+			LoanRepaymentScheduleInstallment currentInstallmentBasedOnTransactionDate = nearestInstallment(loanTransaction.getTransactionDate(), installments);
+			
+			for (LoanRepaymentScheduleInstallment installment : installments) {
+				if (
+					installment.isInterestDue(currency) && 
+					(installment.isOverdueOn(loanTransaction.getTransactionDate()) || installment.getInstallmentNumber().equals(currentInstallmentBasedOnTransactionDate.getInstallmentNumber()))
+				   ) {	
+					Money interestPortion = installment.payInterestComponent(transactionAmountRemaining);
+					transactionAmountRemaining = transactionAmountRemaining.minus(interestPortion);
+					
+					Money principalPortion = Money.zero(currency);
+					loanTransaction.updateComponents(principalPortion, interestPortion, interestWaivedPortion, Money.zero(transactionAmountRemaining.getCurrency()));
+				}
+			}
+			
+			// With whatever is remaining, pay off principal components of installments
+			for (LoanRepaymentScheduleInstallment installment : installments) {
+				if (installment.isPrincipalNotCompleted(currency) && transactionAmountRemaining.isGreaterThanZero()) {
+					Money principalPortion = installment.payPrincipalComponent(transactionAmountRemaining);
+					transactionAmountRemaining = transactionAmountRemaining.minus(principalPortion);
+					
+					Money interestPortion = Money.zero(currency);
+					loanTransaction.updateComponents(principalPortion, interestPortion, interestWaivedPortion, Money.zero(transactionAmountRemaining.getCurrency()));
+				}
 			}
 		}
 		
-		// With whatever is remaining, pay off principal components of installments
-		for (LoanRepaymentScheduleInstallment installment : installments) {
-			if (installment.isPrincipalNotCompleted(currency) && transactionAmountRemaining.isGreaterThanZero()) {
-				Money principalPortion = installment.payPrincipalComponent(transactionAmountRemaining);
-				transactionAmountRemaining = transactionAmountRemaining.minus(principalPortion);
-				
-				Money interestPortion = Money.zero(currency);
-				Money interestWaivedPortion = Money.zero(currency);
-				loanTransaction.updateComponents(principalPortion, interestPortion, interestWaivedPortion, Money.zero(transactionAmountRemaining.getCurrency()));
-			}
-		}
-
 		return transactionAmountRemaining;
 	}
 
@@ -119,18 +128,26 @@ public class AdhikarLoanRepaymentScheduleTransactionProcessor extends AbstractLo
 			final LoanRepaymentScheduleInstallment currentInstallment,
 			final LoanTransaction loanTransaction,
 			final Money transactionAmountUnprocessed) {
-
-		Money transactionAmountRemaining = transactionAmountUnprocessed;
 		
-		Money interestPortion = currentInstallment.payInterestComponent(transactionAmountRemaining);
-		transactionAmountRemaining = transactionAmountRemaining.minus(interestPortion);
-
-		Money principalPortion = currentInstallment.payPrincipalComponent(transactionAmountRemaining);
-		transactionAmountRemaining = transactionAmountRemaining.minus(principalPortion);
-
+		Money transactionAmountRemaining = transactionAmountUnprocessed;
 		Money interestWaivedPortion = Money.zero(transactionAmountRemaining.getCurrency());
-		loanTransaction.updateComponents(principalPortion, interestPortion,interestWaivedPortion, Money.zero(transactionAmountRemaining.getCurrency()));
-
+		Money principalPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		Money interestPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		Money chargesPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		
+		if (loanTransaction.isWaiver()) {
+			interestWaivedPortion = currentInstallment.waiveInterestComponent(transactionAmountRemaining);
+			transactionAmountRemaining = transactionAmountRemaining.minus(interestWaivedPortion);
+		} else {
+		
+			interestPortion = currentInstallment.payInterestComponent(transactionAmountRemaining);
+			transactionAmountRemaining = transactionAmountRemaining.minus(interestPortion);
+	
+			principalPortion = currentInstallment.payPrincipalComponent(transactionAmountRemaining);
+			transactionAmountRemaining = transactionAmountRemaining.minus(principalPortion);
+		}
+		
+		loanTransaction.updateComponents(principalPortion, interestPortion, interestWaivedPortion, chargesPortion);
 		return transactionAmountRemaining;
 	}
 

mifosng-provider/src/main/java/org/mifosng/platform/loan/domain/CreocoreLoanRepaymentScheduleTransactionProcessor.java

@@ -79,20 +79,24 @@ public class CreocoreLoanRepaymentScheduleTransactionProcessor extends
 			final Money transactionAmountUnprocessed) {
 
 		Money transactionAmountRemaining = transactionAmountUnprocessed;
-
-		Money interestPortion = currentInstallment
-				.payInterestComponent(transactionAmountRemaining);
-		transactionAmountRemaining = transactionAmountRemaining
-				.minus(interestPortion);
-
-		Money principalPortion = currentInstallment
-				.payPrincipalComponent(transactionAmountRemaining);
-		transactionAmountRemaining = transactionAmountRemaining
-				.minus(principalPortion);
-
 		Money interestWaivedPortion = Money.zero(transactionAmountRemaining.getCurrency());
-		loanTransaction.updateComponents(principalPortion, interestPortion, interestWaivedPortion, Money.zero(transactionAmountRemaining.getCurrency()));
-
+		Money principalPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		Money interestPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		Money chargesPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		
+		if (loanTransaction.isWaiver()) {
+			interestWaivedPortion = currentInstallment.waiveInterestComponent(transactionAmountRemaining);
+			transactionAmountRemaining = transactionAmountRemaining.minus(interestWaivedPortion);
+		} else {
+		
+			interestPortion = currentInstallment.payInterestComponent(transactionAmountRemaining);
+			transactionAmountRemaining = transactionAmountRemaining.minus(interestPortion);
+	
+			principalPortion = currentInstallment.payPrincipalComponent(transactionAmountRemaining);
+			transactionAmountRemaining = transactionAmountRemaining.minus(principalPortion);
+		}
+		
+		loanTransaction.updateComponents(principalPortion, interestPortion, interestWaivedPortion, chargesPortion);
 		return transactionAmountRemaining;
 	}
 

mifosng-provider/src/main/java/org/mifosng/platform/loan/domain/DefaultLoanLifecycleStateMachine.java

@@ -52,7 +52,7 @@ public class DefaultLoanLifecycleStateMachine implements LoanLifecycleStateMachi
 				newState = stateOf(LoanStatus.APPROVED, allowedLoanStatuses);
 			}
 			break;
-		case LOAN_REPAYMENT:
+		case LOAN_REPAYMENT_OR_WAIVER:
 			if (this.anyOfAllowedWhenComingFrom(from, LoanStatus.ACTIVE, LoanStatus.CLOSED, LoanStatus.OVERPAID)) {
 				newState = stateOf(LoanStatus.ACTIVE, allowedLoanStatuses);
 			} else {

mifosng-provider/src/main/java/org/mifosng/platform/loan/domain/HeavensFamilyLoanRepaymentScheduleTransactionProcessor.java

@@ -65,31 +65,38 @@ public class HeavensFamilyLoanRepaymentScheduleTransactionProcessor extends Abst
 			final List<LoanRepaymentScheduleInstallment> installments,
 			final LoanTransaction loanTransaction,
 			final LocalDate transactionDate, final Money paymentInAdvance) {
-
+		
+		final MonetaryCurrency currency = paymentInAdvance.getCurrency();
 		Money transactionAmountRemaining = paymentInAdvance;
-		MonetaryCurrency currency = paymentInAdvance.getCurrency();
+		Money interestWaivedPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		Money principalPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		Money interestPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		Money chargesPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		
+		if (loanTransaction.isWaiver()) {
+			interestWaivedPortion = currentInstallment.waiveInterestComponent(transactionAmountRemaining);
+			transactionAmountRemaining = transactionAmountRemaining.minus(interestWaivedPortion);
+		} else {
 
-		// placeholders for tracking the breakdown of components relevant to
-		// this transaction.
-		Money principalPortion = Money.zero(currency);
-		Money interestPortion = Money.zero(currency);
-		Money interestWaivedPortion = Money.zero(currency);
+			if (currentInstallment.isPrincipalNotCompleted(currency)) {
+				principalPortion = currentInstallment.payPrincipalComponent(transactionAmountRemaining);
+				if (currentInstallment.isPrincipalCompleted(currency)) {
+					interestWaivedPortion = currentInstallment.waiveInterestComponent(currentInstallment.getInterest(currency));
+				}
 
-		if (currentInstallment.isPrincipalNotCompleted(currency)) {
-			principalPortion = currentInstallment
-					.payPrincipalComponent(transactionAmountRemaining);
-			if (currentInstallment.isPrincipalCompleted(currency)) {
-				interestWaivedPortion = currentInstallment
-						.waiveInterestComponent(currentInstallment
-								.getInterest(currency));
+				loanTransaction.updateComponents(principalPortion, interestPortion, interestWaivedPortion, chargesPortion);
+
+				transactionAmountRemaining = transactionAmountRemaining.minus(principalPortion);
 			}
-
-			loanTransaction.updateComponents(principalPortion, interestPortion, interestWaivedPortion, Money.zero(transactionAmountRemaining.getCurrency()));
-
-			transactionAmountRemaining = transactionAmountRemaining
-					.minus(principalPortion);
+		
+			interestPortion = currentInstallment.payInterestComponent(transactionAmountRemaining);
+			transactionAmountRemaining = transactionAmountRemaining.minus(interestPortion);
+	
+			principalPortion = currentInstallment.payPrincipalComponent(transactionAmountRemaining);
+			transactionAmountRemaining = transactionAmountRemaining.minus(principalPortion);
 		}
-
+		
+		loanTransaction.updateComponents(principalPortion, interestPortion, interestWaivedPortion, chargesPortion);
 		return transactionAmountRemaining;
 	}
 	
@@ -101,18 +108,27 @@ public class HeavensFamilyLoanRepaymentScheduleTransactionProcessor extends Abst
 			final LoanRepaymentScheduleInstallment currentInstallment,
 			final LoanTransaction loanTransaction,
 			final Money transactionAmountUnprocessed) {
-
+		
+		
 		Money transactionAmountRemaining = transactionAmountUnprocessed;
-
-		Money interestPortion = currentInstallment.payInterestComponent(transactionAmountRemaining);
-		transactionAmountRemaining = transactionAmountRemaining.minus(interestPortion);
-
-		Money principalPortion = currentInstallment.payPrincipalComponent(transactionAmountRemaining);
-		transactionAmountRemaining = transactionAmountRemaining.minus(principalPortion);
-
 		Money interestWaivedPortion = Money.zero(transactionAmountRemaining.getCurrency());
-		loanTransaction.updateComponents(principalPortion, interestPortion, interestWaivedPortion, Money.zero(transactionAmountRemaining.getCurrency()));
-
+		Money principalPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		Money interestPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		Money chargesPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		
+		if (loanTransaction.isWaiver()) {
+			interestWaivedPortion = currentInstallment.waiveInterestComponent(transactionAmountRemaining);
+			transactionAmountRemaining = transactionAmountRemaining.minus(interestWaivedPortion);
+		} else {
+		
+			interestPortion = currentInstallment.payInterestComponent(transactionAmountRemaining);
+			transactionAmountRemaining = transactionAmountRemaining.minus(interestPortion);
+	
+			principalPortion = currentInstallment.payPrincipalComponent(transactionAmountRemaining);
+			transactionAmountRemaining = transactionAmountRemaining.minus(principalPortion);
+		}
+		
+		loanTransaction.updateComponents(principalPortion, interestPortion, interestWaivedPortion, chargesPortion);
 		return transactionAmountRemaining;
 	}
 

mifosng-provider/src/main/java/org/mifosng/platform/loan/domain/Loan.java

@@ -582,65 +582,42 @@ public class Loan extends AbstractAuditableCustom<AppUser, Long> {
 			}
 		}
 	}
-
-	public void waive(final LoanTransaction loanTransaction, final LoanLifecycleStateMachine loanLifecycleStateMachine) {
+	
+	/**
+	 * 
+	 * @param amount The amount of interest to be waived.
+	 * @param transactionDate The date on which the interest waiver is to be processed against.
+	 * @param defaultLoanLifecycleStateMachine 
+	 * 
+	 * @return {@link LoanTransaction} details of executed transaction
+	 */
+	public LoanTransaction waiveInterest(
+			final BigDecimal amount, 
+			final LocalDate transactionDate,
+			final LoanLifecycleStateMachine loanLifecycleStateMachine) {
 		
-		LoanStatus statusEnum = loanLifecycleStateMachine.transition(LoanEvent.LOAN_REPAYMENT, LoanStatus.fromInt(this.loanStatus));
-		this.loanStatus = statusEnum.getValue();
+		final Money amountToWaive = Money.of(loanCurrency(), amount);
+		final LoanTransaction waiveInterestTransaction = LoanTransaction.waiver(this, amountToWaive, transactionDate);
 		
-		loanTransaction.updateLoan(this);
-		this.loanTransactions.add(loanTransaction);
-
-		LocalDate loanTransactionDate = loanTransaction.getTransactionDate();
-		if (loanTransactionDate.isBefore(this.getDisbursementDate())) {
-			final String errorMessage = "The transaction date cannot be before the loan disbursement date: "
-					+ getApprovedOnDate().toString();
-			throw new InvalidLoanStateTransitionException("waive",
-					"cannot.be.before.disbursement.date", errorMessage,
-					loanTransactionDate, this.getDisbursementDate());
-		}
-
-		if (loanTransactionDate.isAfter(new LocalDate())) {
-			final String errorMessage = "The transaction date cannot be in the future.";
-			throw new InvalidLoanStateTransitionException("waive",
-					"cannot.be.a.future.date", errorMessage, loanTransactionDate);
-		}
-
-		if (getTotalOutstanding().isGreaterThan(this.getInArrearsTolerance())) {
-			final String errorMessage = "Waiver is only allowed when the total outstanding amount left on loan ("
-					+ getTotalOutstanding()
-					+ ") is less than the in arrears tolerance setting of "
-					+ getInArrearsTolerance().getAmount();
-			throw new InvalidLoanStateTransitionException("waive",
-					"cannot.exceed.in.arrears.tolerance.setting", errorMessage,
-					getTotalOutstanding(), getInArrearsTolerance());
-		}
-
-		Money waived = Money.of(getCurrency(), loanTransaction.getAmount());
-		if (waived.isGreaterThan(this.getInArrearsTolerance())) {
-			final String errorMessage = "The amount being waived cannot exceed the in arrears tolerance setting of "
-					+ getInArrearsTolerance().getAmount();
-			throw new InvalidLoanStateTransitionException("waive",
-					"cannot.exceed.in.arrears.tolerance.setting", errorMessage,
-					waived, getInArrearsTolerance());
-		}
-
-		doPostLoanTransactionChecks(loanTransaction, loanLifecycleStateMachine);
+		handleRepaymentOrWaiverTransaction(waiveInterestTransaction, loanLifecycleStateMachine, null);		
+		
+		return waiveInterestTransaction;
 	}
 
-    public void updateTotalChargesDueAtDisbursement(){
+    public void updateTotalChargesDueAtDisbursement() {
         this.totalChargesDueAtDisbursement = deriveSumTotalOfChargesDueAtDisbursement();
     }
 
 	public void makeRepayment(final LoanTransaction loanTransaction, final LoanLifecycleStateMachine loanLifecycleStateMachine) {
-		handleRepaymentTransaction(loanTransaction, loanLifecycleStateMachine, false);
+		handleRepaymentOrWaiverTransaction(loanTransaction, loanLifecycleStateMachine, null);
 	}
 
-	private void handleRepaymentTransaction(
+	private void handleRepaymentOrWaiverTransaction(
 			final LoanTransaction loanTransaction,
-			final LoanLifecycleStateMachine loanLifecycleStateMachine, final boolean adjusted) {
+			final LoanLifecycleStateMachine loanLifecycleStateMachine,
+			final LoanTransaction adjustedTransaction) {
 		
-		LoanStatus statusEnum = loanLifecycleStateMachine.transition(LoanEvent.LOAN_REPAYMENT, LoanStatus.fromInt(this.loanStatus));
+		LoanStatus statusEnum = loanLifecycleStateMachine.transition(LoanEvent.LOAN_REPAYMENT_OR_WAIVER, LoanStatus.fromInt(this.loanStatus));
 		this.loanStatus = statusEnum.getValue();
 		
 		loanTransaction.updateLoan(this);
@@ -649,33 +626,44 @@ public class Loan extends AbstractAuditableCustom<AppUser, Long> {
 		
 		this.loanTransactions.add(loanTransaction);
 
-		if (loanTransaction.isNotRepayment()) {
-			final String errorMessage = "A transaction of type repayment was expected but not received.";
+		if (loanTransaction.isNotRepayment() && loanTransaction.isNotWaiver()) {
+			final String errorMessage = "A transaction of type repayment or waiver was expected but not received.";
 			throw new InvalidLoanTransactionTypeException("transaction",
-					"is.not.a.repayment.transaction", errorMessage);
+					"is.not.a.repayment.or.waiver.transaction", errorMessage);
 		}
 
 		LocalDate loanTransactionDate = loanTransaction.getTransactionDate();
 		if (loanTransactionDate.isBefore(this.getDisbursementDate())) {
 			final String errorMessage = "The transaction date cannot be before the loan disbursement date: "
 					+ getApprovedOnDate().toString();
-			throw new InvalidLoanStateTransitionException("repayment",
+			throw new InvalidLoanStateTransitionException("transaction",
 					"cannot.be.before.disbursement.date", errorMessage,
 					loanTransactionDate, this.getDisbursementDate());
 		}
 
 		if (loanTransactionDate.isAfter(new LocalDate())) {
 			final String errorMessage = "The transaction date cannot be in the future.";
-			throw new InvalidLoanStateTransitionException("repayment",
+			throw new InvalidLoanStateTransitionException("transaction",
 					"cannot.be.a.future.date", errorMessage, loanTransactionDate);
 		}
 		
-		List<LoanTransaction> repaymentsOrWaivers = retreiveListOfRepaymentOrWaiverTransactionsPostDisbursement();
+		if (loanTransaction.isWaiver()) {
+			Money totalInterestOutstandingOnLoan = getTotalInterestOutstandingOnLoan();
+			if (adjustedTransaction != null) {
+				totalInterestOutstandingOnLoan = totalInterestOutstandingOnLoan.plus(adjustedTransaction.getAmount());
+			}
+			if (loanTransaction.getAmount(loanCurrency()).isGreaterThan(totalInterestOutstandingOnLoan)) {
+				final String errorMessage = "The amount of interest to waive cannot be greater than total interest outstanding on loan.";
+				throw new InvalidLoanStateTransitionException("waive.interest",
+						"amount.exceeds.total.outstanding.interest", errorMessage, loanTransaction.getAmount(), totalInterestOutstandingOnLoan.getAmount());
+			}
+		}
 		
 		final LoanRepaymentScheduleTransactionProcessor loanRepaymentScheduleTransactionProcessor = this.transactionProcessor.determineProcessor(this.transactionProcessingStrategy);
-		if (isTransactionChronologicallyLatest && !adjusted) {
+		if (isTransactionChronologicallyLatest && adjustedTransaction == null) {
 			loanRepaymentScheduleTransactionProcessor.handleTransaction(loanTransaction, getCurrency(), this.repaymentScheduleInstallments);
 		} else {
+			final List<LoanTransaction> repaymentsOrWaivers = retreiveListOfRepaymentOrWaiverTransactionsPostDisbursement();
 			loanRepaymentScheduleTransactionProcessor.handleTransaction(repaymentsOrWaivers, getCurrency(), this.repaymentScheduleInstallments);
 		}
 		
@@ -777,8 +765,7 @@ public class Loan extends AbstractAuditableCustom<AppUser, Long> {
 	}
 
 	public Money possibleNextRepaymentAmount() {
-		MonetaryCurrency currency = this.loanRepaymentScheduleDetail
-				.getPrincipal().getCurrency();
+		MonetaryCurrency currency = this.loanRepaymentScheduleDetail.getPrincipal().getCurrency();
 		Money possibleNextRepaymentAmount = Money.zero(currency);
 
 		for (LoanRepaymentScheduleInstallment installment : this.repaymentScheduleInstallments) {
@@ -790,26 +777,43 @@ public class Loan extends AbstractAuditableCustom<AppUser, Long> {
 
 		return possibleNextRepaymentAmount;
 	}
+	
+	public LoanTransaction deriveDefaultInterestWaiverTransaction() {
+		
+		final Money totalInterestOutstanding = getTotalInterestOutstandingOnLoan();
+		Money possibleInterestToWaive = totalInterestOutstanding.copy();
+		LocalDate transactionDate = new LocalDate();
+		
+		if (totalInterestOutstanding.isGreaterThanZero()) {
+			// find earliest known instance of overdue interest and default to that
+			for (LoanRepaymentScheduleInstallment scheduledRepayment : this.repaymentScheduleInstallments) {
+				
+				final Money outstandingForPeriod = scheduledRepayment.getInterestOutstanding(loanCurrency());
+				if (scheduledRepayment.isOverdueOn(new LocalDate()) && scheduledRepayment.isNotFullyCompleted() && outstandingForPeriod.isGreaterThanZero()) {
+					transactionDate = scheduledRepayment.getDueDate();
+					possibleInterestToWaive = outstandingForPeriod;
+					break;
+				}
+			}
+		}
+
+		return LoanTransaction.waiver(this, possibleInterestToWaive, transactionDate);
+	}
 
 	public void adjustExistingTransaction(
-			LoanTransaction transactionForAdjustment,
-			LoanTransaction newTransactionDetail,
-			LoanLifecycleStateMachine loanLifecycleStateMachine) {
+			final LoanTransaction transactionForAdjustment,
+			final LoanTransaction newTransactionDetail,
+			final LoanLifecycleStateMachine loanLifecycleStateMachine) {
 
-		if (transactionForAdjustment.isNotRepayment()
-				&& transactionForAdjustment.isNotWaiver()) {
+		if (transactionForAdjustment.isNotRepayment() && transactionForAdjustment.isNotWaiver()) {
 			final String errorMessage = "A transaction of type repayment or waiver was expected but not received.";
 			throw new InvalidLoanTransactionTypeException("transaction",
 					"is.not.a.repayment.or.waiver.transaction", errorMessage);
 		}
 
 		transactionForAdjustment.contra();
-		if (newTransactionDetail.isRepayment()) {
-			handleRepaymentTransaction(newTransactionDetail, loanLifecycleStateMachine, true);
-		}
-
-		if (newTransactionDetail.isWaiver()) {
-			waive(newTransactionDetail, loanLifecycleStateMachine);
+		if (newTransactionDetail.isRepayment() || newTransactionDetail.isWaiver()) {
+			handleRepaymentOrWaiverTransaction(newTransactionDetail, loanLifecycleStateMachine, transactionForAdjustment);
 		}
 	}
 
@@ -1240,8 +1244,7 @@ public class Loan extends AbstractAuditableCustom<AppUser, Long> {
 	}
 
 	private Money getTotalInterestOnLoan() {
-		Money cumulativeInterest = Money.zero(this.loanRepaymentScheduleDetail
-				.getPrincipal().getCurrency());
+		Money cumulativeInterest = Money.zero(loanCurrency());
 
 		for (LoanRepaymentScheduleInstallment scheduledRepayment : this.repaymentScheduleInstallments) {
 			cumulativeInterest = cumulativeInterest.plus(scheduledRepayment
@@ -1250,6 +1253,31 @@ public class Loan extends AbstractAuditableCustom<AppUser, Long> {
 
 		return cumulativeInterest;
 	}
+	
+	private Money getTotalInterestOutstandingOnLoan() {
+		Money cumulativeInterest = Money.zero(loanCurrency());
+
+		for (LoanRepaymentScheduleInstallment scheduledRepayment : this.repaymentScheduleInstallments) {
+			cumulativeInterest = cumulativeInterest.plus(scheduledRepayment.getInterestOutstanding(loanCurrency()));
+		}
+
+		return cumulativeInterest;
+	}
+	
+	@SuppressWarnings("unused")
+	private Money getTotalInterestOverdueOnLoan() {
+		Money cumulativeInterestOverdue = Money.zero(this.loanRepaymentScheduleDetail.getPrincipal().getCurrency());
+
+		for (LoanRepaymentScheduleInstallment scheduledRepayment : this.repaymentScheduleInstallments) {
+			
+			final Money interestOutstandingForPeriod = scheduledRepayment.getInterestOutstanding(loanCurrency());
+			if (scheduledRepayment.isOverdueOn(new LocalDate())) {
+				cumulativeInterestOverdue = cumulativeInterestOverdue.plus(interestOutstandingForPeriod);
+			}
+		}
+
+		return cumulativeInterestOverdue;
+	}
 
 	private Money getTotalPrincipalOnLoan() {
 		Money cumulativePrincipal = Money.zero(this.loanRepaymentScheduleDetail

mifosng-provider/src/main/java/org/mifosng/platform/loan/domain/LoanEvent.java

@@ -2,7 +2,7 @@ package org.mifosng.platform.loan.domain;
 
 public enum LoanEvent {
 
-	LOAN_CREATED, LOAN_REJECTED, LOAN_WITHDRAWN, LOAN_APPROVED, LOAN_APPROVAL_UNDO, LOAN_DISBURSED, LOAN_DISBURSAL_UNDO, LOAN_REPAYMENT,
+	LOAN_CREATED, LOAN_REJECTED, LOAN_WITHDRAWN, LOAN_APPROVED, LOAN_APPROVAL_UNDO, LOAN_DISBURSED, LOAN_DISBURSAL_UNDO, LOAN_REPAYMENT_OR_WAIVER,
 	//
 	REPAID_IN_FULL, LOAN_WRITE_OFF, LOAN_RESCHEDULE, INTERST_REBATE_OWED, LOAN_OVERPAYMENT;
 }

mifosng-provider/src/main/java/org/mifosng/platform/loan/domain/LoanRepaymentScheduleInstallment.java

@@ -93,6 +93,10 @@ public class LoanRepaymentScheduleInstallment extends AbstractAuditableCustom<Ap
 		return Money.of(currency, this.principalCompleted);
 	}
 	
+	public Money getPrincipalOutstanding(final MonetaryCurrency currency) {
+		return getPrincipal(currency).minus(getPrincipalCompleted(currency));
+	}
+	
 	public Money getInterest(final MonetaryCurrency currency) {
 		return Money.of(currency, this.interest);
 	}
@@ -104,15 +108,23 @@ public class LoanRepaymentScheduleInstallment extends AbstractAuditableCustom<Ap
 	public Money getInterestWaived(final MonetaryCurrency currency) {
 		return Money.of(currency, this.interestWaived);
 	}
+	
+	public Money getInterestOutstanding(final MonetaryCurrency currency) {
+		return getInterest(currency).minus(getInterestCompleted(currency).plus(getInterestWaived(currency)));
+	}
 
 	public boolean isInterestDue(final MonetaryCurrency currency) {
 		return getInterest(currency).minus(getInterestCompleted(currency).plus(getInterestWaived(currency))).isGreaterThanZero();
 	}
 	
-	public Money getTotal(MonetaryCurrency currency) {
+	public Money getTotal(final MonetaryCurrency currency) {
 		return getPrincipal(currency).plus(getInterest(currency));
 	}
 	
+	public Money getTotalOutstanding(final MonetaryCurrency currency) {
+		return getPrincipalOutstanding(currency).plus(getInterestOutstanding(currency));
+	}
+	
 	public void updateLoan(final Loan loan) {
 		this.loan = loan;
 	}
@@ -151,12 +163,10 @@ public class LoanRepaymentScheduleInstallment extends AbstractAuditableCustom<Ap
 
 	public Money payInterestComponent(final Money transactionAmountRemaining) {
 		
-		MonetaryCurrency currency = transactionAmountRemaining.getCurrency();
-		
+		final MonetaryCurrency currency = transactionAmountRemaining.getCurrency();
 		Money interestPortionOfTransaction = Money.zero(currency);
 		
-		Money interestExpected = getInterest(currency);
-		Money interestDue = interestExpected.minus(getInterestCompleted(currency));
+		final Money interestDue = getInterestOutstanding(currency);
 		if (transactionAmountRemaining.isGreaterThanOrEqualTo(interestDue)) {
 			this.interestCompleted = getInterestCompleted(currency).plus(interestDue).getAmount();
 			interestPortionOfTransaction = interestPortionOfTransaction.plus(interestDue);
@@ -172,11 +182,10 @@ public class LoanRepaymentScheduleInstallment extends AbstractAuditableCustom<Ap
 
 	public Money payPrincipalComponent(final Money transactionAmountRemaining) {
 		
-		MonetaryCurrency currency = transactionAmountRemaining.getCurrency();
+		final MonetaryCurrency currency = transactionAmountRemaining.getCurrency();
 		Money principalPortionOfTransaction = Money.zero(currency);
 		
-		Money principalExpected = getPrincipal(currency);
-		Money principalDue = principalExpected.minus(getPrincipalCompleted(currency));
+		final Money principalDue = getPrincipalOutstanding(currency);
 		if (transactionAmountRemaining.isGreaterThanOrEqualTo(principalDue)) {
 			this.principalCompleted = getPrincipalCompleted(currency).plus(principalDue).getAmount();
 			principalPortionOfTransaction = principalPortionOfTransaction.plus(principalDue);
@@ -194,8 +203,7 @@ public class LoanRepaymentScheduleInstallment extends AbstractAuditableCustom<Ap
 		MonetaryCurrency currency = transactionAmountRemaining.getCurrency();
 		Money waivedInterestPortionOfTransaction = Money.zero(currency);
 		
-		Money interestExpected = getInterest(currency);
-		Money interestDue = interestExpected.minus(getInterestCompleted(currency));
+		Money interestDue = getInterestOutstanding(currency);
 		if (transactionAmountRemaining.isGreaterThanOrEqualTo(interestDue)) {
 			this.interestWaived = getInterestWaived(currency).plus(interestDue).getAmount();
 			waivedInterestPortionOfTransaction = waivedInterestPortionOfTransaction.plus(interestDue);

mifosng-provider/src/main/java/org/mifosng/platform/loan/domain/LoanTransaction.java

@@ -69,23 +69,23 @@ public class LoanTransaction extends AbstractAuditableCustom<AppUser, Long> {
     }
     
     public static LoanTransaction disbursement(final Money amount, final LocalDate disbursementDate) {
-		return new LoanTransaction(LoanTransactionType.DISBURSEMENT, amount.getAmount(), disbursementDate);
+		return new LoanTransaction(null, LoanTransactionType.DISBURSEMENT, amount.getAmount(), disbursementDate);
 	}
     
 	public static LoanTransaction repayment(final Money amount, final LocalDate paymentDate) {
-		return new LoanTransaction(LoanTransactionType.REPAYMENT, amount.getAmount(), paymentDate);
+		return new LoanTransaction(null, LoanTransactionType.REPAYMENT, amount.getAmount(), paymentDate);
 	}
 	
 	public static LoanTransaction repaymentAtDisbursement(final Money amount, final LocalDate paymentDate) {
-		return new LoanTransaction(LoanTransactionType.REPAYMENT_AT_DISBURSEMENT, amount.getAmount(), paymentDate);
+		return new LoanTransaction(null, LoanTransactionType.REPAYMENT_AT_DISBURSEMENT, amount.getAmount(), paymentDate);
 	}
 	
-	public static LoanTransaction waiver(final Money waived, final LocalDate waiveDate) {
-		return new LoanTransaction(LoanTransactionType.WAIVED, waived.getAmount(), waiveDate);
+	public static LoanTransaction waiver(final Loan loan, final Money waived, final LocalDate waiveDate) {
+		return new LoanTransaction(loan, LoanTransactionType.WAIVED, waived.getAmount(), waiveDate);
 	}
 	
-	private static LoanTransaction contra(LoanTransaction originalTransaction) {
-		LoanTransaction contra = new LoanTransaction(LoanTransactionType.REVERSAL, originalTransaction.getAmount().negate(), new LocalDate(originalTransaction.getDateOf()));
+	private static LoanTransaction contra(final LoanTransaction originalTransaction) {
+		LoanTransaction contra = new LoanTransaction(null, LoanTransactionType.REVERSAL, originalTransaction.getAmount().negate(), new LocalDate(originalTransaction.getDateOf()));
 		contra.updateContra(originalTransaction);
 		return contra;
 	}
@@ -94,7 +94,8 @@ public class LoanTransaction extends AbstractAuditableCustom<AppUser, Long> {
 		this.contra = transaction;
 	}
 
-	private LoanTransaction(final LoanTransactionType type, final BigDecimal amount, final LocalDate date) {
+	private LoanTransaction(final Loan loan, final LoanTransactionType type, final BigDecimal amount, final LocalDate date) {
+		this.loan = loan;
 		this.typeOf = type.getValue();
         this.amount = amount;
 		this.dateOf = date.toDateMidnight().toDate();

mifosng-provider/src/main/java/org/mifosng/platform/loan/domain/LoanTransactionComparator.java

@@ -3,13 +3,28 @@ package org.mifosng.platform.loan.domain;
 import java.util.Comparator;
 
 /**
- *
+ * Sort loan transactions by transaction date and transaction type placing
  */
 public class LoanTransactionComparator implements Comparator<LoanTransaction> {
 
     @Override
     public int compare(final LoanTransaction o1, final LoanTransaction o2) {
-		return o1.getTransactionDate().compareTo(o2.getTransactionDate());
+    	int compareResult = 0;
+		final int comparsion = o1.getTransactionDate().compareTo(o2.getTransactionDate());
+		if (comparsion == 0) {
+			// equal transaction dates
+			if (o1.isWaiver() && o2.isNotWaiver()) {
+				compareResult = -1;
+			} else if (o1.isNotWaiver() && o2.isWaiver()) {
+				compareResult = 1;
+			} else {
+				compareResult = 0;
+			}
+		} else {
+			compareResult = comparsion;
+		}
+		
+		return compareResult;
     }
 
 }

mifosng-provider/src/main/java/org/mifosng/platform/loan/domain/MifosStyleLoanRepaymentScheduleTransactionProcessor.java

@@ -68,22 +68,26 @@ public class MifosStyleLoanRepaymentScheduleTransactionProcessor extends
 			final LoanRepaymentScheduleInstallment currentInstallment,
 			final LoanTransaction loanTransaction,
 			final Money transactionAmountUnprocessed) {
-
+		
 		Money transactionAmountRemaining = transactionAmountUnprocessed;
-
-		Money interestPortion = currentInstallment
-				.payInterestComponent(transactionAmountRemaining);
-		transactionAmountRemaining = transactionAmountRemaining
-				.minus(interestPortion);
-
-		Money principalPortion = currentInstallment
-				.payPrincipalComponent(transactionAmountRemaining);
-		transactionAmountRemaining = transactionAmountRemaining
-				.minus(principalPortion);
-
 		Money interestWaivedPortion = Money.zero(transactionAmountRemaining.getCurrency());
-		loanTransaction.updateComponents(principalPortion, interestPortion,interestWaivedPortion, Money.zero(transactionAmountRemaining.getCurrency()));
-
+		Money principalPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		Money interestPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		Money chargesPortion = Money.zero(transactionAmountRemaining.getCurrency());
+		
+		if (loanTransaction.isWaiver()) {
+			interestWaivedPortion = currentInstallment.waiveInterestComponent(transactionAmountRemaining);
+			transactionAmountRemaining = transactionAmountRemaining.minus(interestWaivedPortion);
+		} else {
+		
+			interestPortion = currentInstallment.payInterestComponent(transactionAmountRemaining);
+			transactionAmountRemaining = transactionAmountRemaining.minus(interestPortion);
+	
+			principalPortion = currentInstallment.payPrincipalComponent(transactionAmountRemaining);
+			transactionAmountRemaining = transactionAmountRemaining.minus(principalPortion);
+		}
+		
+		loanTransaction.updateComponents(principalPortion, interestPortion, interestWaivedPortion, chargesPortion);
 		return transactionAmountRemaining;
 	}
 

mifosng-provider/src/main/java/org/mifosng/platform/loan/service/LoanReadPlatformService.java

@@ -10,6 +10,7 @@ import org.mifosng.platform.api.data.LoanBasicDetailsData;
 import org.mifosng.platform.api.data.LoanPermissionData;
 import org.mifosng.platform.api.data.LoanRepaymentTransactionData;
 import org.mifosng.platform.api.data.LoanTransactionData;
+import org.mifosng.platform.api.data.LoanTransactionNewData;
 
 public interface LoanReadPlatformService {
 
@@ -29,7 +30,7 @@ public interface LoanReadPlatformService {
 
 	LoanTransactionData retrieveNewLoanRepaymentDetails(Long loanId);
 
-	LoanTransactionData retrieveNewLoanWaiverDetails(Long loanId);
+	LoanTransactionNewData retrieveNewLoanWaiveInterestDetails(Long loanId);
 
 	LoanTransactionData retrieveLoanTransactionDetails(Long loanId, Long transactionId);
 }

mifosng-provider/src/main/java/org/mifosng/platform/loan/service/LoanReadPlatformServiceImpl.java

@@ -20,6 +20,7 @@ import org.mifosng.platform.api.data.LoanProductData;
 import org.mifosng.platform.api.data.LoanRepaymentTransactionData;
 import org.mifosng.platform.api.data.LoanSchedulePeriodData;
 import org.mifosng.platform.api.data.LoanTransactionData;
+import org.mifosng.platform.api.data.LoanTransactionNewData;
 import org.mifosng.platform.api.data.MoneyData;
 import org.mifosng.platform.client.service.ClientReadPlatformService;
 import org.mifosng.platform.currency.domain.ApplicationCurrency;
@@ -285,40 +286,30 @@ public class LoanReadPlatformServiceImpl implements LoanReadPlatformService {
 	}
 
 	@Override
-	public LoanTransactionData retrieveNewLoanWaiverDetails(final Long loanId) {
+	public LoanTransactionNewData retrieveNewLoanWaiveInterestDetails(final Long loanId) {
 
 		context.authenticatedUser();
 
-		// TODO - OPTIMIZE - write simple sql query to fetch back date of
-		// possible next transaction date.
+		// TODO - OPTIMIZE - write simple sql query to fetch back overdue interest that can be waived along with the date of repayment period interest is overdue.
 		Loan loan = this.loanRepository.findOne(loanId);
 		if (loan == null) {
 			throw new LoanNotFoundException(loanId);
 		}
 
-		final String currencyCode = loan.repaymentScheduleDetail()
-				.getPrincipal().getCurrencyCode();
-		ApplicationCurrency currency = this.applicationCurrencyRepository
-				.findOneByCode(currencyCode);
+		final String currencyCode = loan.repaymentScheduleDetail().getPrincipal().getCurrencyCode();
+		ApplicationCurrency currency = this.applicationCurrencyRepository.findOneByCode(currencyCode);
 		if (currency == null) {
 			throw new CurrencyNotFoundException(currencyCode);
 		}
-
 		CurrencyData currencyData = new CurrencyData(currency.getCode(),
 				currency.getName(), currency.getDecimalPlaces(),
 				currency.getDisplaySymbol(), currency.getNameCode());
 
-		Money totalOutstanding = loan.getTotalOutstanding();
-		MoneyData totalOutstandingData = MoneyData.of(currencyData,
-				totalOutstanding.getAmount());
+		LoanTransaction waiveOfInterest = loan.deriveDefaultInterestWaiverTransaction();
 
-		LoanTransactionData newWaiverDetails = new LoanTransactionData();
-		newWaiverDetails.setTransactionType(LoanEnumerations
-				.transactionType(LoanTransactionType.WAIVED));
-		newWaiverDetails.setDate(new LocalDate());
-		newWaiverDetails.setTotal(totalOutstandingData);
-
-		return newWaiverDetails;
+		EnumOptionData waiverEnum = LoanEnumerations.transactionType(LoanTransactionType.WAIVED);
+		
+		return new LoanTransactionNewData(waiverEnum, currencyData, waiveOfInterest.getTransactionDate(), waiveOfInterest.getAmount());
 	}
 
 	@Override

mifosng-provider/src/main/java/org/mifosng/platform/loan/service/LoanWritePlatformService.java

@@ -45,7 +45,7 @@ public interface LoanWritePlatformService {
 	EntityIdentifier adjustLoanTransaction(AdjustLoanTransactionCommand command);
 
 	@PreAuthorize(value = "hasAnyRole('PORTFOLIO_MANAGEMENT_SUPER_USER_ROLE')")
-	EntityIdentifier waiveLoanAmount(LoanTransactionCommand command);
+	EntityIdentifier waiveInterestOnLoan(LoanTransactionCommand command);
 
     @PreAuthorize(value = "hasRole('ORGANISATION_ADMINISTRATION_SUPER_USER_ROLE')")
     EntityIdentifier addLoanCharge(LoanChargeCommand command);

mifosng-provider/src/main/java/org/mifosng/platform/loan/service/LoanWritePlatformServiceJpaRepositoryImpl.java

@@ -495,7 +495,7 @@ public class LoanWritePlatformServiceJpaRepositoryImpl implements LoanWritePlatf
 		LocalDate transactionDate = command.getTransactionDate();
 		LoanTransaction newTransactionDetail = LoanTransaction.repayment(transactionAmount, transactionDate);
 		if (transactionToAdjust.isWaiver()) {
-			newTransactionDetail = LoanTransaction.waiver(transactionAmount, transactionDate);
+			newTransactionDetail = LoanTransaction.waiver(loan, transactionAmount, transactionDate);
 		}
 
 		loan.adjustExistingTransaction(transactionToAdjust, newTransactionDetail, defaultLoanLifecycleStateMachine());
@@ -515,33 +515,26 @@ public class LoanWritePlatformServiceJpaRepositoryImpl implements LoanWritePlatf
 	
 	@Transactional
 	@Override
-	public EntityIdentifier waiveLoanAmount(LoanTransactionCommand command) {
+	public EntityIdentifier waiveInterestOnLoan(final LoanTransactionCommand command) {
 		
 		context.authenticatedUser();
 
-		LoanTransactionCommandValidator validator = new LoanTransactionCommandValidator(command);
+		final LoanTransactionCommandValidator validator = new LoanTransactionCommandValidator(command);
 		validator.validate();
 		
-		Loan loan = this.loanRepository.findOne(command.getLoanId());
+		final Loan loan = this.loanRepository.findOne(command.getLoanId());
 		if (loan == null) {
 			throw new LoanNotFoundException(command.getLoanId());
 		}
 		
-		Money waived = Money.of(loan.repaymentScheduleDetail()
-				.getPrincipal().getCurrency(),
-				command.getTransactionAmount());
-
-		LoanTransaction waiver = LoanTransaction.waiver(waived, command.getTransactionDate());
-		
-		loan.waive(waiver, defaultLoanLifecycleStateMachine());
-		
-		this.loanTransactionRepository.save(waiver);
+		final LoanTransaction waiveTransaction = loan.waiveInterest(command.getTransactionAmount(), command.getTransactionDate(), defaultLoanLifecycleStateMachine());
 		
+		this.loanTransactionRepository.save(waiveTransaction);
 		this.loanRepository.save(loan);
 		
-		String noteText = command.getNote();
+		final String noteText = command.getNote();
 		if (StringUtils.isNotBlank(noteText)) {
-			Note note = Note.loanTransactionNote(loan, waiver, noteText);
+			final Note note = Note.loanTransactionNote(loan, waiveTransaction, noteText);
 			this.noteRepository.save(note);
 		}