SYSML2_ — Apparent use of an overly-generic notation entry in subsetting or redefinition notation specification for Connection end

I think these specifications in section 8 are too generic.

a-subsetting =
'«subsets»' ownedRelationship (',' ownedRelationship)*
a-redefinition =
'«redefines»' ownedRelationship (',' ownedRelationship)*

There is no single ownedRelationship = or ownedRelationship : but several ownedRelationship += which I interpret to mean that this is the property that would be added to when parsing.
The first of these would surely be OwnedSubsetting which has a OwnedSubsetting : specification.