Reversal voucher vs Unposting voucher

Hello,

I have a scenario where the user has a matched & posted voucher (not paid) where the vendor ID is wrong. In order to correct this, we unposted the voucher- changed the accounting date to current date on the unpost voucher page . After the control group was opened, the fields became editable. Next we ran unmatching. The previous PO receipt with the wrong vendor ID was canceled, vendor ID changed on the PO, and PO was received again. On the AP side, the same voucher with the correct vendor ID can now be saved by pulling the same PO#