In T175570: Don’t check some constraint types on non-statement contexts, I thought it didn’t make sense to check “type” constraints on qualifiers and references, so I disabled them.

Then, in T177388: Check “type” constraint on qualifiers and references, I noticed that it does make a lot of sense to check “type” constraints on qualifiers, so I enabled them again (on qualifiers and references).

And now, after seeing this in action on Wikidata, I’m considering whether I want to disable it again for references. The violations I’ve seen are properties like “title”, “publication date”, “ISSN”, which describe the work of the reference, not the main subject item (in cases where the reference doesn’t have an item of its own, e. g. a “reference URL” reference).

Are there any cases where “type” constraints do make sense in references? E. g. some property that should only be used in references for buildings?