Issue with creating voucher from PO line

Hello,

We are on PeopleSoft 9.2. There is a scenario where the user created an adjustment voucher without checking the box Reverse Qty/Amt on the voucher Worksheet page. The original voucher being related to a receipt, the receipt qty/amt is not adjusted. The encumbrance on the PO is adjusted because the Adjust Mtch Value/Encumbrance checkbox is checked correctly. The result is in the PO activity page, the matched amount is not zero as expected. Both the original and the credit vouchers have been approved, matched, posted and paid. The receipt is closed. Now, the user is trying to create a new voucher by pulling the same PO receipt which is no more available. How can we correct the error and create a new voucher with the receipt. Please advise.