I think that when you map inheritance to multiple tables, and use a native (database) sequence manager for generating the ids, you have to make sure yourself that the entries in the different tables get the same primarykey. If you use a app-space sequence manager (nextval for example), then OJB should do this for you. I'm sorry that I can't help you more, but my experience with mapping using super-references is limited, and in an EJB environment even more. You could search the user mailing list archives for application server and sequence manager or mapping to multiple tables.
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