Apply an On-Account Amount
Apply an on-account amount to a customer invoice to distribute a customer's on-account balance.
This can occur when a customer remits an amount greater than the invoice's due amount. You must post the customer receipt as an on-account amount before you can apply it to an invoice. If you haven't posted the customer receipt yet, you can modify the customer receipt to distribute the entire receipt instead of posting the on-account and applying it separately.