Use this procedure only if your transactions are unchangeable.
The payment you want to reverse should be displayed. (To find a bill payment)
If you're reversing a payment from a previous accounting period, consider assigning a date from that period to the transaction you just created. This will allow your reports for that accounting period to reflect the proper amounts.
If you reversed a bill payment that was originally used to fully pay a purchase and a discount applies for paying promptly, you will see a message. If you see this message, continue to step 4.
If no prompt-payment discount applied to the transaction to which you originally applied the payment, you're done -- the payment is reversed.
Choose Reverse Payment from the Edit menu, then click the Record button to reverse the discount.