Return/RMA to a different customer

This is a 'point of sale' scenario - A customer walks in for the first time and asks for an item (for quantity 10). We do not create a new customer for this 'one time customer' scenario. Instead we pick up a default customer name (XX) in sales order and close it. Issue is with the customer returns as we cannot create an rma for the default customer (XX). All returns should be made against the actual customer as payment has to be reversed. Now, for returns, we will create this one time customer in AR and then record an