Entry Multipayment Voucher for the same PO that already had one voucher full match in receiver line

Dear Team,

My Userr had a problem input another multipayment Voucher for the same PO. After I checked, turns out the voucher that previously enter had receiver line with full amout instead of partial amount just like in invoice amount. Thus user cannot select the same PO.

My question is, what can we do to make the PO can be selected again for making another voucher since it actually just partially paid?

please kindly give your advice on this. any feedback is appreciated.

Thank you.