Re: Strange error message

Chuck, that's it!


Now I perfectly understand because my model used to work when I was 
using unique PKs.
I guess I must rollback to the first implementation ... and find a way 
to generate PK shorter than the default implementation.


Thanks to everybody that helped me to solve the problem!!!


Camille




On Tuesday, Oct 8, 2002, at 19:59 Europe/Paris, Chuck Hill wrote:

> Ah Ha!  I know the answer.  EOs in an inheritance hierarchy MUST MUST 
> MUST have unique primary keys.  That is the only way that EOF can 
> differentiate which class an object is.  In your case
>
> RootClass ----> EntityA
>           ----> EntityB
>
> No object of EntityA, EntityB (or RootClass if not abstract) can have 
> the same PK.   If EOF fetches an instance of EntityA with a PK of 
> 1000, and then fetches an instance of EntityB with a PK of 1000 it 
> will think (because the EOGlobalID is the same) that the EntityB 
> instance is actually the EntityA instance.