issue of storing inherited relationship entity

[magoafono]

Dear all,
we are trying to store (and retrieve) two nodes (type A and B) linked by a relationship entity with a inhering type

    R (abstract)
    ^
    CR (concrete)
    |
A ====> B

Where R is the abstract @RelationshipEntity and the CR is the concrete @RelationshipEntity.

When we save the sub-graph A->CR->B the stored "real" types are A->R->B.

In other word, the abstract relationship type is used by OGM instead of the concrete one so the load fails.

Here the code:

@NodeEntity
public class A {
    private Long id;
    private R r;

    public R getR() {
        return r;
    }

    public void setR(R c) {
        this.r = c;
    }
}

@NodeEntity
public class B {
    private Long id;
}

@RelationshipEntity
public abstract class R {
    private Long id;

    @StartNode
    private A a;

    @EndNode
    private B b;

    public A getA() {
        return a;
    }

    public void setA(A a) {
        this.a = a;
    }

    public B getB() {
        return b;
    }

    public void setB(B b) {
        this.b = b;
    }

}

@RelationshipEntity
public class CR extends R {
 //some stuff here ...
}

import java.util.ArrayList;
import java.util.Collection;
import org.neo4j.ogm.session.Session;

public class Tester {

    public static void main(String[] args) {
        Tester tester = new Tester();
        tester.test4();
        tester.test5();
    }

    private void test4() {
        Session session = Neo4jSessionFactory.getNeo4jSession();
        session.beginTransaction();

        A a = new A();
        B b = new B();

        CR r = new CR();
        r.setA(a);
        r.setB(b);

        a.setR(r);

        session.save(a);

        session.getTransaction().commit();
    }

    private void test5() {
        Session session = Neo4jSessionFactory.getNeo4jSession();
        session.beginTransaction();

        Collection<A> as = session.loadAll(A.class);

        for (A a : as) {
            System.out.println(a.getR());
        }

        session.getTransaction().commit();
    }

}