Can I use @In EntityManager entityManager; in an entity bean ?

I have this in my entity bean :

@Transient
@In(required=true)
EntityManager entityManager;

But the entityManager is always null.
I works in other classes thought, si I wonder if it's possible ?

Is this related to this : http://www.jboss.com/index.html?module=bb&op=viewtopic&t=107353