Purchase order management tools vary enormously in price and surface area and converge on the same five requirements. All five are inexpensive to have in any product and expensive or impossible to add later, and between them they support matching, accruals and delivery chasing, which is the whole reason to have a tool rather than a template.
Numbering and approval sequence
Unique numbers issued automatically from one source, never reused, because a reused number makes two transactions permanently indistinguishable downstream. And approval before the order reaches the supplier, since the commitment exists once they act on it. Approval afterwards is a review, which is weaker and worth naming honestly rather than calling it a control.
Line-level receipts and dated revisions
Ordered, received and invoiced quantities held per line, so partial deliveries are representable and the accrual comes free. And revisions kept with their dates rather than overwritten, so what was agreed when is answerable during a supplier disagreement. Tools missing either are document generators with a system's name on them.
A readable export
Orders, lines, receipts, revisions and approvals in a format you can open without the vendor. Organisations change these tools more often than they plan, usually because they outgrow the first, and an export that omits receipt history makes the next move considerably worse. Test it in a trial rather than accepting a description.
What to test in five minutes
Order ten, receive four, invoice four, and ask what is outstanding on that line. The answer should be six. Then change the price on an approved order and check the previous value is still visible with its date. Two tests, ten minutes, and they separate systems from templates more reliably than any feature list.
Questions people ask about purchase order management tools
Is our accounting module enough?
Sometimes. Check line-level receipting and revisions specifically, since those are the usual gaps rather than the ordering itself.
What is worth paying extra for?
Usability at the delivery point, because receipting is the step that most often fails and everything downstream depends on it.
When should we upgrade?
When somebody starts a spreadsheet alongside the tool to track what is outstanding. That spreadsheet is the system trying to exist.