I just stumbeled upon your question concerning the update of the discrete set of values.
We have the same requirement, we need a daily update of the discrete set of values for a certain IBA on a WTDoc subtype.
In fact the discrete set should contain hundreds of values, I don't know if this is even possible.
Did you find a way to update the discrete set without having to use the "Type- and Attribute Manager"-GUI?
I am looking for the same solution which you tired. Did you get any answer.. If so, please drop me a note to my mail id
- with details.