As a Media Communications Company, how do we ensure that we match POs values given to us by Clients/Customers against the Payments we make to various Vendors? This is to mitigate the risk of over paying our Vendors. So that once the bulk amounts written on the POs are exhaustively paid to Vendors. It would not be possible to make any payments to Vendors using the exhausted PO number/code. Meaning Posting can only be done using a new PO code/ number.