C2MS12 — Inconsistent Fields MVAL Response and AMVAL Response

The AMVAL Response and AMVAL Data messages mostly line up with MVAL Response and MVAL Data messages, but not quite. The AMVAL Response, for example, contains no samples, which are present for all of MVAL Response, MVAL Data and AMVAL Data. Also, AMVAL Response, contains a Product Subtype Category not found in any of the others. This needs analysis and convergence to align these messages better.

Probably just need to do some analysis regarding comparative usages and fields to determine if it is correct as-is and if not, make them more consistent.

There is a related issue regarding required versus optional fields that is being resolved in C2MS12-42.