In cases where a purchase order includes multiple shipments and invoices, it is sometimes necessary to create a prepayment invoice after the initial standard invoice has been posted. However, the option to create a prepayment invoice is currently unavailable(greyed out) once the first standard invoice is posted.

Business Scenario: For instance, if a purchase order (PO) includes 100 quantity of an item, and the initial invoice is posted for 10 quantity, system is not allowing us to create a prepayment invoice for the remaining quantity on the PO.