Storage and routing are table stakes in this category, which makes feature comparison unproductive. What differs is behaviour on the invoices that do not go smoothly, and that behaviour is what your team experiences daily. Three questions about the awkward cases separate a shortlist faster than any requirements matrix.
What does an exception carry
The reason, the two numbers that disagree, the line involved, an owner and an age, or merely the fact that something failed. The first makes each exception a short specific conversation; the second makes it a research task. This single design difference changes how the queue feels more than any other property of the product.
Where can an exception go
Can it be routed to purchasing or to a site without leaving the record, and can the recipient respond inside the system. Exceptions that migrate into email lose their history, and the history is what you need when the same problem recurs with the same supplier next quarter, which it will.
What happens when nothing happens
Does an unattended item escalate to a named alternative after a defined period, or does it just age. Ageing without escalation produces a queue everybody knows is bad and nobody can point at. Test it by submitting something in a trial and deliberately leaving it alone for the escalation period.
Questions people ask about invoice management solution
Does storage differ between products?
Barely. Search, retention and export are worth checking but rarely decide anything.
How do we test exception handling?
Force a mismatch with your own documents and look at the screen your team would see. Ask to see it rather than accepting a description.
What about integration?
It matters for the ledger and for orders and receipts. Ask what a failed integration looks like operationally, not just whether a connector exists.