title: Bidirectional relationship in MappedSuperclass
body: <p>In JPA2.0 specification is written:</p>
  
  <blockquote>
    <p>Persistent relationships defined by a
    mapped superclass must be
    unidirectional.</p>
  </blockquote>
  
  <p>Why can't be used bidirectional relationship in @MappedSuperclass class? I tried it in Hibernate and it looks that it works, can be there some problem with it?</p>
  
  <p>We're generating our model so we need specified all relations in @MappedSuperclass class and extend this class with @Entity class which contains just handwritten code.</p>