Matched PO line still has amount left to voucher

Hi - we are on Peoplesoft 9.1

We created a PO line for 60k and a QTY of 1.

We created a receipt and invoice against it for 3K - it matched and paid. Now we have 57K left. It should have been an amount only PO but was not setup that way.

Do we have any options to handle the remaining unvouchered amount of 57K for that PO line?

Thanks

Pete