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Eclipselink merge fails to generate UPDATE statement for changed value
public class A {
    ...
    @Id
    @Column(name = "A_ID")
    @SequenceGenerator(...)
    @GeneratedValue(...)
    public Long getA_ID();

    @OneToOne(mappedBy = "a", fetch = FetchType.LAZY, cascade = CascadeType.ALL, targetEntity = B.class)
    public B getB();
    ...
}

@VirtualAccessMethods(get = "getMethod", set = "setMethod")
public class B {
    ...

    @Id
    public Long getA_ID();

    @MapsId
    @OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL ,targetEntity = A.class)
    @JoinColumn(name="A_ID")
    public A getA();

    getMethod(String name);

    setMethod(String name, Object value);
    ...
}

@Transactional
public void update(Object fieldOnANewValue, Object fieldOnBNewField) {
    A objA = em.executeQuery(...) //loads objA by primary key
    objA.setFieldOnA(fieldOnANewValue);
    B objB = objA.getB(); //lazy loads objB
    objB.setMethod("FieldOnB", fieldOnBNewValue);
}