We have a customer that has several stores.  We have them set up as individual stores in our customer file.  One of the stores we'll say #1384 paid an invoices double, so a credit was issued for #1384.  I received a check and the credit was used for other stores say # 1321.  I followed the instruction that I found  to do a Journal debiting Accounts Receivable for the amount of the credit using the 1384 and then credited the amount to Accounts Receivable using the 1321.  QuickBooks wouldn't let me save the transaction saying I can't use Accounts Receivable in more than one line.  How should I transfer this credit?