I've made Person abstract in the model. I've deleted the redundant EO (AMUserPreference), and UserPreference (which is in the same framework as Person) points to the abstract Person entity. I no longer generate a 'person' table, as I won't be instantiating Person.

That might be a bad idea. Some databases ( FrontBase) need this base table for PK generation.

Seriously? I would consider that a serious flaw. PK generation should always happen at the abstract level... You're saying that in FrontBase, you can't have primary keys based in an abstract entity??
He's saying exactly the opposite. If Person is abstract, you can't delete the Person table because it will be used for PK generation.

ms

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