If you accidentally reversed the wrong payment, you will just need to re-enter it in the system.  Use the original date of the transaction and apply it to the same Invoice to which it was originally applied.  Once you have applied and posted the transaction, go to Daily Deposit Processing.  You do not want to update the bank balance with the “new” transaction since it updated the balance when originally entered.  Instead, right click on the transaction and choose Assign Bank Rec ID.  Enter 999 and click OK.  This will clear it out of the Deposit Processing screen without updating the AP Bank Balance. Also, if you used the current month for the Transaction Reversal Date, you will want to change that to the original date of the payment.  To do this, choose ACTION, View Reversals.  Set your date range to include the original date of the transaction.  Locate and highlight the transaction and then right click and choose Change Date Voided. Enter the original date of the transaction and click OK.