Aman-Mittal commented on code in PR #5401:
URL: https://github.com/apache/fineract/pull/5401#discussion_r2747150436


##########
fineract-progressive-loan/src/main/java/org/apache/fineract/portfolio/loanaccount/domain/transactionprocessor/impl/AdvancedPaymentScheduleTransactionProcessor.java:
##########
@@ -2189,11 +2189,18 @@ private void handleZeroInterestChargeOff(final 
LoanTransaction loanTransaction,
                         }
                     });
 
-            final Money amountToEditLastInstallment = 
loanTransaction.getLoan().getPrincipal().minus(installments.stream() //
-                    .filter(i -> i.getPrincipal() != null) //
+            final BigDecimal totalCreditedPrincipal = installments.stream() //
                     .filter(i -> !i.isAdditional()) //
-                    .map(LoanRepaymentScheduleInstallment::getPrincipal) //
-                    .reduce(ZERO, BigDecimal::add));
+                    .map(i -> MathUtil.nullToZero(i.getCreditedPrincipal())) //
+                    .reduce(ZERO, BigDecimal::add);
+
+            final Money amountToEditLastInstallment = 
loanTransaction.getLoan().getPrincipal() //
+                    .plus(Money.of(currency, totalCreditedPrincipal)) //
+                    .minus(installments.stream() //
+                            .filter(i -> i.getPrincipal() != null) //
+                            .filter(i -> !i.isAdditional()) //
+                            
.map(LoanRepaymentScheduleInstallment::getPrincipal) //
+                            .reduce(ZERO, BigDecimal::add));

Review Comment:
   I think we can break down this logic further
   
   
   .filter(i -> i.getPrincipal() != null) //
                               .filter(i -> !i.isAdditional())   This filter 
can be  combined
   
   
   this business logic can be broken down based on following
   
   scheduledPrincipal -> installments.stream() //
                               .filter(i -> i.getPrincipal() != null 
&&!i.isAdditional()) //
                               
.map(LoanRepaymentScheduleInstallment::getPrincipal) //
                               .reduce(ZERO, BigDecimal::add)
   
   
   final Money totalPrincipal = loanTransaction.getLoan().getPrincipal()
           .plus(Money.of(currency, totalCreditedPrincipal));
   
   final Money amountToEditLastInstallment = 
totalPrincipal.minus(scheduledPrincipal);
   
   



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