No idea. I think Emmanuel had a better understanding of the derived identifier 
logic. 



On 27 Jan 2014, at 06:26, Steve Ebersole <st...@hibernate.org> wrote:

> What's the rational for supporting the following?
> 
> 
> @Entity
> class Product {
>    ...
> }
> 
> @Entity
> class Order {
>    ...
> }
> 
> @Entity
> @IdClass(...)
> class OrderLine {
>    @Id
>    private Order order;
> 
>    @Id
>    private Product product;
> }
> 
> Specifically, the declaration of the OrderLine primary key.  Why would
> these not have to be `@Id @ManyToOne`?
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> hibernate-dev@lists.jboss.org
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