In looking at the snapshotMustSupport view - this only shows that both backbone elements collection and container are MustSupport, but does not give detail on the elements within it that are needed - all are marked as 0..

I would expect to have these elements listed as required:

specimen.collection.collected

at least one of the elements of specimen.container, since the backbone is required.

I would expect to have these elements listed as MustSupport:

specimen.collection.collector (especially since you have that role concept in your IG specific valueset)

specimen.collection.bodySite

specimen.collection.method (though that could possibly be taken care of by a reference to the procedure (I think we have a CR out to make method a codableReference - if not we should maybe consider that?)