Credit Memo from Closed (Paid) AR Invoice

There are main correction documents for the sales process in SAP Business One, one of them is the A/R Credit Memo. The A/R Credit Memo (credit note) is the document used to process returned items or to give a pricing credit once an A/R invoice has been issued. But what if the A/R Invoice status is closed? Can we make A/R Credit Memo based on the A/R Invoice? SAP Business One has the solution! If an A/R Invoice has already been paid, you must first right-click and select “Change Document Status to Open” before you can “Copy To” a Credit