Hi Glen,
More is often good! Although you did give additional information than I asked for, I think you did address my questions in the latter part of your response. What you said about the possibility of mapping 'subset' structures (in function context) with the full-blown DDIC ones was a useful revelation!
Thanks again for your last response. I just checked and validated that you are right in doubting that the system would allow addition of a data element (created automatically when a table object was created) when the parent table object is already a part of the context and vice versa.