Hi Brian,
Did you make it working? I think there was a bug in TopLink Essentials, where a subclass couldn't be used in a relationship. A Mapped Superclass can't be target of a relationship according to the spec (see 2.1.9.2 Mapped Superclasses).
Also, I'm wondering if it works to map a discrim field and designate it a @DiscriminatorColumn?
Regards,
-marina
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