Using gae Key in model leads to a finder with the (Key id) param

Hi all

My problem in a few line is that for a domain object:
public class OrderItem {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
private Key id;
//...
}

I find my self with
@RooGwtRequest("fr.onevu.vume.model.OrderItem")
@ServiceName("fr.onevu.vume.model.OrderItem")
public interface OrderItemRequest extends RequestContext {
abstract Request<fr.onevu.vume.client.proxy.OrderItemProxy> findOrderItem(Key id);

//...
}

Wich doesn't compile since Key can't be transformed to javascript.

A possible workaround would be to define a Key substitute in GWT (as done for the java.lang classes), but I think this coice should be left to developers (who can decide to translate the key to a String for the web).

Best Regards,
Zied Hamdi