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start with the following: @MappedSuperclass public class MappedSuperclassType { @OneToOne private EntityType entity; @OneToOne private EntityType entity2; } @Entity public class EntityType extends MappedSuperclassType { } Check the Attribute Overrides UI and see that there are two implied overrides: entity and entity2. Type the following in to source: @AssociationOverride(name="entity") Check the UI again, and see that the implied override for entity2 is gone. It's there, actually, but the label appears to be blank. Not reproducible always, but seems to happen mostly on first try.
Moving JPA specific bugs to new JPA component in bugzilla.