Does it make sense to use QueuedPessimisticEJBLock and optimistic-locking simultaneously?

Question

I'm working on a J2EE application where the EntityBeans (EJB 2.1) are using the container configuration "Standard CMP 2.x EntityBean" which uses the locking-policy QueuedPessimisticEJBLock:

      <container-configuration>
         <container-name>Standard CMP 2.x EntityBean</container-name>
...
         <locking-policy>org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock</locking-policy>
...
      </container-configuration> 

Also in the jbosscmp-jdbc.xml the EntityBeans are configured to use optimistic-locking:

  <entity>
   ...
    <optimistic-locking>
        <modified-strategy/>
    </optimistic-locking>
  </entity>

Does it make any sense to use additional optimistic locking when the rows are locked anyway due to the QueuedPessimisticEJBLock locking policy?