Level 2

Transferring credit from one customer to another customer but QB says I can't use 2 AR accounts in same entry

I need to transfer a credit balance from one customer's account to another customer's account.  The answer to my question was to do journal entry where both Debit & Credit are posted to AR with the names of the customer accounts in the name drop down.  QB will not let me save this entry saying you cannot use more than 1 AR or AP account in the same transaction.  So how do I do this?