I also had a customer pay twice. Actually, the check was printed with the same number and the bank rejected the second one. So I created a credit with the second check payment on the customer's account. I was able to match up my deposit records that way. But now my customer shows a credit which is no longer available because the bank returned the duplicate check. I don't know whether to create a credit, a refund, a journal entry, an invoice...My accounting know-how is not advanced enough to handle this! Help!