PersistenceProvider featureSet.add() doesn't work

[umajeric]

I have overriden the method validate() in MyEntityQuery (extends EntityQuery):

     info("PersistenceProvider.instance(): "+PersistenceProvider.instance().getClass());
     if (!PersistenceProvider.instance().supportsFeature(Feature.WILDCARD_AS_COUNT_QUERY_SUBJECT)) {
          info("!supportsFeature WILDCARD");
     }

I get an output:

PersistenceProvider.instance(): class org.jboss.seam.persistence.HibernatePersistenceProvider
!supportsFeature WILDCARD

In HibernatePersistenceProvider there is

featureSet.add(Feature.WILDCARD_AS_COUNT_QUERY_SUBJECT);

but it is not enabled in my class. So I get some errors in entities wih composite keys. I should have 'WILDCARD AS COUNT QUERY SUBJECT' enabled.
Any idea?

Thanks, uros