The entity version cannot be validated. It is the target of a sync relationship

I'm getting this error when trying to run the stored procedure mdm.udpValidateModel. It smells like a bug to me, SP shouldn't be trying to validate entities that have been designated as "Sync Target"

MDSERR200226|The entity version cannot be validated. It is the target of a sync relationship., @ErrorNumber = 50000, @ErrorProcedure = "udpValidateEntity", line 34