Unfortunately there is no quick button to correct a closed bill and issue a credit note.

To correct the bill, follow these steps:

• Go to the customer profile and click on the billing
• Select the revenue item(s) you are trying to correct and post a negative charge.
• Move the revenue items into the bill of the guest, and select the payment, against which you will refund the guest. Post the (positive) payment.
• Close the bill.
• Once the bill is closed it functions as a correction of the original bill. In the notes of the correction bill you could also mention which bill you are rebating.