Administration guide > Troubleshoot > Messages > CWPRJ: Messages for the Projector component
CWPRJ1004E
INVALID_ASSOCIATION_KEY_CARDINALITY_CWPRJ1004E=CWPRJ1004E: Invalid association. Associations that are also keys can only have uni-directional OneToOne or ManyToOne relationships.
Explanation
Entities cannot use multi-valued associations as keys. All keys must be attributes or uni-directional OneToOne or ManyToOne relationships.
User response
Review the metadata for the entity key associations and verify that the entity does not use OneToMany or ManyToMany associations.
Parent topic:
CWPRJ: WebSphere eXtreme Scale messages for the Projector component for entity and tuple projection