Suggestions:
As per the Finance process we can confirm or cancelled the unconfirmed Purchase “Voucher” Transaction in VISION. As cancellation of vouchers is not available in the system, The system allows to confirm zero value transactions and confirm it.
In case of advance voucher which was generated against PO advance payment terms, if payment is made then the users have to adjust it in misc_receipt adjustment, if payment is not done then first confirm transaction and adjust payment with payment against voucher with advance adjustment as payment type.