To fix the issue, follow the steps below:
Go to Transactions, Open Item Debtor Menu, Bill Payment Ledger, Check Duplicated GlpostEntry.
Click on Ok, Exit.
Tick the Generate Glpost Entry No.
Click Yes, OK.
Click Cancel.
Now go to Reports, More Reports (1), Bank Reconciliation Statement.
Key in Period.
Key in Account No.
Mark the transactions and click Accept.
Go to Bank Reconciliation reports, unmark all items to reset the report.
Go to Housekeeping, Upgrade data files and file organization, mark all.
Go to Transaction, Open - Item Menu Debtors, Bill Payment Ledger, Check Duplicate GL Entry Post, Mark Generate Glpost Entry No. when duplicate entries are found.
Open Bank Reconciliation reports, Mark all and check.
Note: If the above solution does not resolve the issue, please delete the transaction and re-enter it.