This control oversees the voucher number sequence and has an option to check whether the voucher number has been used before or not. There are then four different action options, as shown in the General ledger parameters screenshot, which you can access from General ledger | Ledger setup | General ledger parameters:
The four options are:
- Reject duplicate: The system will prevent you using the same voucher again
- Reject duplicates within fiscal year: The system will prevent you using the same voucher again within the same fiscal year, in the next fiscal year the voucher number could be used
- Accept duplicates: The system will allow you to reuse the same voucher number
- Warn in case of duplicates: The system will allow to reuse the same voucher number but will warn the user
The recommended option is to reject duplicates. In cases where the customer business requires you to accept duplicate options, it should be very well analyzed, and verified by the customer finance team, as it may cause reporting issues in future.