Hibernate: changing value of discriminator field

[Oleg SanbIch]

Hello,

How do I change the value of discriminator field in Hibernate?
I have a hierarchy of classes:
UserVO <---- NewUser <---- IncompleteUser <------ ActiveUser

Where <---- means "extends", UserVO is an abstract class at the top of hierarchy. All these classes are mapped to the same 'user' table with discriminator field 'USER_TYPE'. Now if I have a record with 'NewUser' value in discriminator field and want to change it to 'IncompleteUser' (user status changes), how do I do that with Hibernate?

Thanks,
-Oleg.