MIFOSX-1421 : corrected remove installment charge and add a new installment charge issues

mifosng-provider/src/main/java/org/mifosplatform/portfolio/loanaccount/domain/Loan.java

@@ -622,7 +622,7 @@ public class Loan extends AbstractPersistable<Long> {
             final LocalDate lastRepaymentPeriodDueDate) {
         if (loanCharge.isSpecifiedDueDate()
                 && !loanCharge.isDueForCollectionFromAndUpToAndIncluding(disbursementDate, lastRepaymentPeriodDueDate)) {
-            final String defaultUserMessage = "This charge which is due at disbursement cannot be added as the loan is already disbursed.";
+            final String defaultUserMessage = "This charge with specified due date cannot be added as the it is not in schedule range.";
             throw new LoanChargeCannotBeAddedException("loanCharge", "specified.due.date.outside.range", defaultUserMessage,
                     getDisbursementDate(), getLastRepaymentPeriodDueDate(), loanCharge.name());
         }

mifosng-provider/src/main/java/org/mifosplatform/portfolio/loanaccount/domain/LoanCharge.java

@@ -824,6 +824,7 @@ public class LoanCharge extends AbstractPersistable<Long> {
         this.active = active;
         if (!active) {
             this.overdueInstallmentCharge = null;
+            this.clearLoanInstallmentCharges();
         }
     }