Hi James, My mistake, I should have linked to https://www.wikidata.org/wiki/Property_talk:P1647, which includes the following in the 'Examples' section of the documentation template:
"Note: it is not valid to declare subproperties of instance of (P31) (rdf:type), subclass of (P279) (rdfs:subClassOf) or any other property mapped to a built-in property of RDF, RDFS or OWL. See creation discussion." The creation discussion is available at https://www.wikidata.org/wiki/Wikidata:Property_proposal/Archive/27#subproperty_of . Eric
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