List qualifiers = paper.getQualifiers();
Qualifier qual1 = (Qualifier) qualifiers.get(0);
Qualifier qual2 = (Qualifier) qualifiers.get(1);
// now empty collection and check if changes get persisted
paper.setQualifiers(new RemovalAwareCollection());
Transaction trans = _kit.getTransaction(_conn);
trans.begin();
_conn.makePersistent(paper);
trans.commit();
;