It turns out that, **this time**, at least, the way to compute the
discount is not by “the more expensive”, but “the more expensive _in a
given group_”.
However, there are a couple of options, such as motorhome, that can be
in different groups but only must be used once.
After months of keeping what does the ACSI checkbox mean, now customer
told us that we should add a discount based on a series of
arbitrary conditions that, and need to be done NOW!
There is no UI to edit the conditions due to lack of time.