Answer
Pain usually drops when mappings are documented, versioned, tested in a controlled path, and supported by a repeatable intake process for partner changes. The problem is rarely just the translator. It is the combination of tool flexibility, workflow discipline, and who actually owns partner change management.
Buyers should ask how the software handles reuse, testing, rollback, and visibility into failed transactions after a change goes live. That is where partner maintenance becomes manageable instead of tribal knowledge.