PO MATCHED PREPAYMENT INVOICE - EBS R12.2.9

Dear Team,

We have a requirement to create Prepayment invoice with PO reference- E.g 20 % advance payment.

Our PO contains multiple lines. When we create prepayment invoice with reference to PO (invoice match action = PO) and click on MATCH button, it shows all PO lines with original QTY and Amount which we have to manually adjust against each line based on advance payment %.

Is there a way system can automatically adjust / allocate line qty and amount based on advance payment amount/ %. Or we have to customize this allocation.

Please advise.