I'm still confused about this. My customer created a second invoice # and paid their created invoice and the real invoice, at the same time. I didn't bill them a second invoice. So if I enter the product as a return, it's going to throw my sales and profit numbers off. I have to enter a product in creating the credit memo and no product was sold a second time. I've already issued them a refund check, but need to reconcile the check in my account.