Overriding rules in sub-classes

Is it possible to specifically override a rule when applied to a subclass?

I have
schema:LocalBusiness rdfs:subClassOf schema:Organization

and in the shapes rules for both I have
sh:path schema:sameAs ;
sh:minCount 1 ;

and each has a message, but the message is (slightly) different; when I
validate the file, I get both rules reporting, so there are two messages,
one for Organization, one for LocalBusiness

Is there a general pattern for avoiding this?  I'd like to override the
Organization rule rather than see both.

-- 
Gary Lawrence Murphy <gary@schemaapp.com> - Hunch Manifest, 15 Wyndham N
'C', Guelph