Humm,
Well, you know how when dealing with multiplicity, you can on each side of the relation(ship) specify the Mininum and Maximun for the multiplucity !?
e.g : Programmer (0,n) <----> (0,n)Certification,so are you saying that in EJB, we only use the maximun for multiplicity ?, So the abose example would be : ProgrammerBean(n)<---->(n)CertificationBean - Many-to-Many - ?