One-To-Many and RequestFactory Proxy

I have two entities:

class A {

     @ ManyToOne

     @ Fetch (FetchMode.SELECT)

     @ JoinColumn (name = "b_id")

     B b;

}

class B {

     @ OneToMany (mappedBy = "b")

     @ Fetch (FetchMode.SELECT)

     List <A> a;

}

interface AProxy {

     B getB ();

     setB (B b);

}

interface BProxy {

     List <A> getA ();

     set (List <A> a);

}

If you do not use OneToMany list, then the ComboBox b in the editor does not work, but if you add a OneToMany to a class B then all is well.

Why is this happening?

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