Entity not enhanced exception for mappedsuperclass generic abstract class

Hi,

I’ve created a generic abstract class that I’ve annotated with @MappedSuperClass.
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This class is extended by another class:
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And finally this class is extended by concrete class:
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When the application start, CUBA checks for properly enhanced entity. This check throws an EntityNotEnhancedException. I don’t know why.
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Does someone have a clue ?

Stef.

The SV entity has to be declared in persistence.xml.