We have a problem switching classes on an update of a classes hierarchy :

The Hierarchy :

@Entity
@Table(name = "TOTO")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "TOTO_KIND", length = 4)
Class A
{
}

@Entity
@DiscriminatorValue(value = "A")
Class B extends A
{
}

@Entity
@DiscriminatorValue(value = "B")
Class C extends A
{
}

The problem is :

- save an B.
- Clear the session.
- load a B and switch it to a C (make a C with the same ID).*
- Clear the session.
- load the object with the id and instead of a C we're getting a B.

* DiscriminatorValue is not changed on this step

Is there a way fixing this ?