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see: https://blogs.oracle.com/javajungle/entry/how_to_plug_a_small It looks that by creating more than one FK "ECs from DB" creates embedded object which is not set by new entry creation in the appropriate controller.
Attaching just good point from David if there's not a bug in generated JPA facade.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss