On-account cash for cross customer receipts

Hi,

When entering a cross customer or multi customer receipt, can the "on-account" portion be assigned to a customer number that is different from the customer number shown on the header? For example, I have a receipt that needs to be applied to transactions for 3 different customers. The first customer selected when applying the receipt is customer 123 (which defaults as the customer header when in the application window). I then continue to apply the receipt to transactions for customer 456 and customer 789. I have an unapplied amount remaining. I want to put the unapplied amount as cash "on-account"