Datanucleus: Bidirectional 1-N relation on supertype

Question

I'm trying to model the following relations in datanucleus:

@PersistenceCapable
@Inheritance(strategy = InheritanceStrategy.SUBCLASS_TABLE)
@Discriminator(strategy = DiscriminatorStrategy.CLASS_NAME)
public class Item {

    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.NATIVE)
    private Long id;
}

@PersistenceCapable
public class Address extends Item {

    @Persistent
    protected Item owner;
    ...
}

@PersistenceCapable
public class Customer extends Item {

    @Persistent(mappedBy = "owner")
    @Join
    protected List<Address> addresses;
}

@PersistenceCapable
public class PointOfSales extends Item {
    @Persistent(mappedBy = "owner")
    @Join
    protected List<Address> addresses;
}

Both the PointOfService and the Customer class can have multiple Address relations.

The Address type's owner field on the other should reference the owning object (either Customer or PointOfService.

These are the database tables:

This is the code [UPDATE]:

public class Main {
    public static void main(String args[]) {
        PersistenceManagerFactory pmf = JDOHelper.getPersistenceManagerFactory("Tutorial");

        PersistenceManager pm = pmf.getPersistenceManager();
        Transaction tx = pm.currentTransaction();

        try {
            tx.begin();

            Address addr1 = new Address();
            addr1.setPostalCode("1210");
            Customer cust1 = new Customer();
            cust1.setFirstName("Test");
            // cust1.setAddresses(Arrays.asList(addr1));
            addr1.setOwner(cust1);

            Address addr2 = new Address();
            addr2.setPostalCode("3333");
            Customer cust2 = new Customer();
            cust2.setFirstName("sdgsdgs");
            // cust2.setAddresses(Arrays.asList(addr2));
            addr2.setOwner(cust2);

            pm.makePersistent(addr1);
            pm.makePersistent(addr2);

            pm.makePersistent(cust1);
            pm.makePersistent(cust2);

            addr2.setOwner(cust1);
            pm.makePersistent(addr2);

            PointOfSales pos = new PointOfSales();
            pos.setAddresses(Arrays.asList(addr2));

            // that's the place where the error occurs
            pm.makePersistent(pos);

            tx.commit();

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (tx.isActive()) {
                tx.rollback();
            }
            pm.close();
        }
    }
}

Error occurs at pm.makePersistent(pos)

This results in an error:

javax.jdo.JDOUserException: Object "org.datanucleus.samples.jdo.tutorial.entities.PointOfSales@16fdec90" has a collection "org.datanucleus.samples.jdo.tutorial.entities.PointOfSales.addresses" yet element "org.datanucleus.samples.jdo.tutorial.entities.Address@561868a0" has its owner set to "org.datanucleus.samples.jdo.tutorial.entities.Customer@740d2e78". This is inconsistent and needs correcting.

Do you guys have any idea how to make this work in a way, that I can add an Address to a Customer, and the Address' owner is the automatically populated with the Customer. And vice-versa of too: set the owner and it is automatically added to the corresponding Customer?

Thanks for your help.