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One person reads this. There is no ticket queue and no autoresponder.

Used to reply to you and nothing else. It is not added to a list, because there is no list.

The most useful thing you can send

A platform limit we have got wrong. This sandbox exists because cXML itself imposes almost no length limits — every real limit is imposed by a buyer platform, and those are not published anywhere. If Coupa truncated your description at 254 characters or Ariba dropped a leading zero off a part number, that is a fact nobody has written down, and it belongs in the conformance checks here.

Second most useful: a document this validator judged wrongly. Paste it in. Being confidently wrong is the one failure mode a validator cannot afford.