Outside an OTU decision, you might wish to just program a click through option that allows the user to allow or disallow a particular waiver.
Yeah, the way I'm doing it is a warning in the list of educational choices that says a prerequisite waver is required. If you select that choice, then you are asked if you want to try a prerequisite waver. If you say NO, you are returned to the list of educational choices with no penalty.
Similarly, if any other educational roll fails, you are asked if you want to try for a waiver or accept defeat.