rta.persistence.lock.scope</code> property is specified
 with a value of <code>PessimisticLockScope.EXTENDED</code>.
 The state of entities referenced by such relationships will not
 be locked (unless those entities are explicitly locked).
 Locking such a relationship or element collection generally locks only
 the rows in the join table or collection table for that
 relationship or collection.  This means that phantoms will be
 possible.</div>
</li>
</ul>
</li>
</ul>
</section>
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