What does purchase order software do?
Purchase order software turns an approved need into a commitment with a supplier and keeps that commitment as the reference for everything after. In Bollard, the PO records the agreed price, the terms and the delivery site, and that record is what receiving and invoice matching check against.
The PO is where price leakage can be stopped. If the agreed price lives in an email thread and the invoice arrives a month later, nobody can easily tell whether the supplier billed what was agreed. Locking the price on the PO gives finance a fixed number to hold the invoice to.
