By default, domain properties are required to pass the validation See below about validation. Quick Reference Improve this doc. An alternative is to use table-per-subclass which can be enabled with the ORM DSL However, excessive use of inheritance and table-per-subclass can result in poor query performance due to the use of outer join queries. When I add Volunteer to belong to and make the relationship mapped by on a bidirectional, the nullable is honored and I can leave it unspecified on the detail page. Dismiss alert.
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