>>What advantages do you experience ?
>
>1. I don't have to worry about changes to the key and updating other tables.

hmmm. The RI builder takes care of this. Besides, in generall I don't allow a user to change a key, because of history reasons (historical hardcopy issues).

>2. Easier of the user to enter data. They are not responsible for generating unique IDs.

Well in the example of the articleno, it would sure be handy if they enter a unique value.

Walter,