tx.begin();
pg = (ProductGroup) _conn.getObjectByIdentity(pgOid);
pg.setName("2");
_conn.makePersistent(pg);
tx.checkpoint();
tx.rollback();
tx = _kit.getTransaction(_conn);
tx.begin();
article = (Article) _conn.getObjectByIdentity(aOid);
assertEquals("should be equal", "1", article.getProductGroup().getName());