title: Object is not from this UnitOfWork
body: <p>I get an error saying:</p>
  
  <p>Exception [EclipseLink-6004] ... The Object bla bla is not from this UnitOfWork object space, but from the parent session's. The Object was never registered with this UnitOfWork.</p>
  
  <p>This is an exception that pops up at random. Does anyone have a clue as to how to solve the issue?</p>
  
  <p>thank you for your advice,
  Micha</p>