A problem with obtaining Entity without cache

I use a custom validation constraint.
In the constraint I want to compare old and new entity, but when I take a entity from database, I got a entity witch is equvivalent the new entity.

I tried to use a query without cache

$query = $this->getDoctrine()->getRepository('SSWTestBundle:SimpleEntity')->createNamedQuery(...);
...
$query->useResultCache(FALSE);

This don't solved my problem.

I tried to use a query without cache and with refresh

$query = $this->getDoctrine()->getRepository('SSWTestBundle:SimpleEntity')->createNamedQuery(...);
...
$query->useResultCache(FALSE);
$query->setHint(\Doctrine\ORM\Query::HINT_REFRESH, true);

This time I got a old entity from database, but the new entity was rollback to the old entity.

In attach is my entity and TestCase.