Clear Advance Down Payment without Payment

My client has a requirement regarding Down payments.

They use the Down payment scenario in a Sales Order with billing plan.

They send a FAZ invoice and they do not get the payment.

Days later they send a F2 closing invoice, and they want to process that invoice as the down payment were paid (the invoice amount should consider the FAZ invoices as paid).

Is it possible to clear the FAZ invoice in F-29 not to a BANK account but to a customer pending account so the F2 closing invoice consider the amounts in the FAZ invoice?

Thank you,

Regards,

Carlos