That's very interesting because it works for me:

@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Employee {

    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private Key id;

    private String firstName;

    private String lastName;

}

@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class A (B) {

    public Long getId() {
                return id;
        }

        public void setId(Long id) {
                this.id = id;
        }

        public Employee getE() {
                return e;
        }

        public void setE(Employee e) {
                this.e = e;
        }

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

========================
(regardless if transaction is used or not - simply makePersistent
without transaction)

                PersistenceManager em = EMF.get().getPersistenceManager();
                Employee e = null;
                try {
                        em.currentTransaction().begin();
                A a = new A();
                e = new Employee();
                a.setE(e);
                em.makePersistent(a);
                em.currentTransaction().commit();
                } catch (Exception ee) {
                        em.currentTransaction().rollback();
                }


                try {
                        em.currentTransaction().begin();
                B b = new B();
//              e = new Employee();
                b.setE(e);
                em.makePersistent(b);
                em.currentTransaction().commit();
                } catch (Exception ee) {
                        em.currentTransaction().rollback();
                }

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