Hi, 2 persistent classes : A B extends A.
A have the primary key : id. I was using fetch plan to include id but with the wrong class. I badly added a fetch plan for B.class, id. id was null, because it was finally not included in the fetch plan. This is OK but when I build the fetch plan, why not raising an error message with something like : "no attribute id on B". It took me ages to find my error. After I added the correct fetch plan : A.class, id, everything works fine. What do you think ?