Trying to create a model where Parent1 and Parent2 extend Grandparent, and Child1_1 and Child1_2 extend Parent1 as well as Child2_1 and Child2_2 extend Parent2. I set up my definitions: Grandparent:     type: entity     table: grandparent_table     inheritanceType: JOINED     discriminatorColumn:         name: discriminator_column_grandparent         type: string     repositoryClass: GrandParent     id:         id:             type: integer             generator:                 strateg