The namespace in the subject identifier is not known to or supported by the service The predicate of an association qualifier is not recognized by the service or is not considered to be a valid association qualifier. The target EntityNameOrURI is not known to the service The namespace in the predicate identifier is not known to or supported by the service The service has determined that an association with the same identity criteria as the supplied association already exists in the service. What constitutes identity from an association standpoint is up to the service implementation. The namespace in the predicate identifier is not known to or supported by the service The EntityNameOrURI is not known to the service The namespace in a target entity identifier is not known to or supported by the service