Abhishek6122008 commented on code in PR #6782:
URL: https://github.com/apache/fineract/pull/6782#discussion_r4418257183


##########
fineract-core/src/main/java/org/apache/fineract/portfolio/savings/domain/interest/CompoundInterestHelper.java:
##########
@@ -48,23 +48,42 @@ public Money calculateInterestForAllPostingPeriods(final 
MonetaryCurrency curren
         BigDecimal compoundedInterest = BigDecimal.ZERO;
         BigDecimal unCompoundedInterest = BigDecimal.ZERO;
         final CompoundInterestValues compoundInterestValues = new 
CompoundInterestValues(compoundedInterest, unCompoundedInterest);
-        for (final PostingPeriod postingPeriod : allPeriods) {
-
-            final BigDecimal interestEarnedThisPeriod = 
postingPeriod.calculateInterest(compoundInterestValues);
+        int index = 0;
+        while (index < allPeriods.size()) {
+            final PostingPeriod postingPeriod = allPeriods.get(index);
+            // the overdraft split builds two periods for one posting 
interval, which are calculated together
+            final PostingPeriod otherPeriodOfInterval = index + 1 < 
allPeriods.size()
+                    && hasSameInterval(postingPeriod, allPeriods.get(index + 
1)) ? allPeriods.get(index + 1) : null;
+            final List<PostingPeriod> periodsOfInterval;
+            if (otherPeriodOfInterval == null) {
+                postingPeriod.calculateInterest(compoundInterestValues);
+                periodsOfInterval = List.of(postingPeriod);
+            } else {
+                PostingPeriod.calculateInterest(postingPeriod, 
otherPeriodOfInterval, compoundInterestValues);
+                periodsOfInterval = List.of(postingPeriod, 
otherPeriodOfInterval);
+            }
 
-            final Money moneyToBePostedForPeriod = Money.of(currency, 
interestEarnedThisPeriod);
+            for (final PostingPeriod period : periodsOfInterval) {
+                final Money moneyToBePostedForPeriod = Money.of(currency, 
period.getInterestEarnedUnrounded());
 
-            interestEarned = interestEarned.plus(moneyToBePostedForPeriod);
-            // these checks are for fixed deposit account for not include
-            // interest for accounts which has post interest to linked savings
-            // account and if already transfered then it includes in interest
-            // calculation.
-            if (!(postingPeriod.isInterestTransfered() || 
!interestTransferEnabled
-                    || (lockUntil != null && 
!DateUtils.isAfter(postingPeriod.dateOfPostingTransaction(), lockUntil)))) {
-                compoundInterestValues.setCompoundedInterest(BigDecimal.ZERO);
+                interestEarned = interestEarned.plus(moneyToBePostedForPeriod);
+                // these checks are for fixed deposit account for not include
+                // interest for accounts which has post interest to linked 
savings
+                // account and if already transfered then it includes in 
interest
+                // calculation.
+                if (!(period.isInterestTransfered() || !interestTransferEnabled
+                        || (lockUntil != null && 
!DateUtils.isAfter(period.dateOfPostingTransaction(), lockUntil)))) {
+                    
compoundInterestValues.setCompoundedInterest(BigDecimal.ZERO);
+                }
             }
+            index += periodsOfInterval.size();
         }
 
         return interestEarned;
     }
+
+    private static boolean hasSameInterval(final PostingPeriod postingPeriod, 
final PostingPeriod other) {
+        return 
postingPeriod.getPeriodInterval().startDate().equals(other.getPeriodInterval().startDate())
+                && 
postingPeriod.getPeriodInterval().endDate().equals(other.getPeriodInterval().endDate());
+    }

Review Comment:
   calculateInterestUsing adds the two periods of an interval one right after 
the other, so they're always next to each other. An assertion wouldn't fit, 
since a period with no pair is normal (no split, or one part is empty and gets 
skipped). I added a comment stating the assumption instead.
   



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