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example model:
Building
v 0..* Flat <<abstract>> ^
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Loft Suite
The unit test will throw an exception:
ERROR: Table "FLAT" not found; SQL statement: update Flat set building=?, building_idx=? where flatId=? [42102-177]
This is due to used of union-subclass, in that case indexes have to be created on concrete entities tables as Loft and Suite and not Flat for this example.
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