Hibernate version: 3.1.2 (Annotations 3.1beta8)

I was wondering whether anyone knows whether it is at all possible to create different ids in both a base and subclass. Obviously both ids are distinct and independently maintained. I have:

@Entity
@TableGenerator (...)
@Table(name="...")
@Inheritance(strategy = InheritanceType.JOINED)
public class BaseClass {
private int id;
...
@Id @GeneratedValue(strategy=GenerationType.TABLE, generator="...")
public int getId() {
return id;
}
}

@Entity
@TableGenerator (...)
@Table(name="...")
public class SubClass extends BaseClass {
private int anotherId;
...
@Id @GeneratedValue(strategy=GenerationType.TABLE, generator="...")
public int getAnotherId() {
return anotherId;
}
}

but when I run this I get:

org.hibernate.AnnotationException: Unable to define/override @Id(s) on a subclass: some.package.SubClass

Reason why I need this is not by design but rather that I'm mapping to existing data and this is how it was designed and organised.

I'd be grateful for any pointers!

to make it short, no this is not possible