perform client activation date validation with office activation date

before creation.

mifosng-provider/src/main/java/org/mifosplatform/organisation/office/domain/Office.java

@@ -217,4 +217,8 @@ public class Office extends AbstractPersistable<Long> {
 
         return match;
     }
+    
+    public boolean isBefore(final Date baseDate) {
+          return this.openingDate.before(baseDate);
+    }
 }

mifosng-provider/src/main/java/org/mifosplatform/portfolio/client/domain/Client.java

@@ -356,7 +356,17 @@ public final class Client extends AbstractPersistable<Long> {
             baseDataValidator.reset().parameter("middlename").value(this.middlename).ignoreIfNull().notExceedingLengthOf(50);
             baseDataValidator.reset().parameter("lastname").value(this.lastname).notBlank().notExceedingLengthOf(50);
         }
-
+        
+        if(this.activationDate!=null)
+        {
+            if(!office.isBefore(this.activationDate)){
+                final String defaultUserMessage = "Client activation date cannot be a date before the Office activation date";
+                final ApiParameterError error = ApiParameterError.parameterError("error.msg.clients.activationDate.cannot.be.before.Office.activatoin.date",
+                        defaultUserMessage, "activationDate", this.activationDate);
+                dataValidationErrors.add(error);
+            }
+               
+        }
         if (!dataValidationErrors.isEmpty()) { throw new PlatformApiDataValidationException("validation.msg.validation.errors.exist",
                 "Validation errors exist.", dataValidationErrors); }
     }