I have made an exclusion group as described by John Brinkman http://blogs.adobe.com/formfeed/2008/10/build_a_better_exclusion_group.html, and it works fine.
But I would like to make the exclusion group mandatory. How can I do that?
This issue is still very relevant for me, so I try once more.
As the exclusion group that he is creating is not a "real" object I do not see how this can be done.
I woudl post the question to John on his blog. He may have a way of doing it.
The answer was there, right in front of me. Just had to read John's blog more thoroughly and move on to the next step. And now it works.