When doing classification for multiple report suites, there is an alert when one or more report suites have a different/existing configuration:
The classifications for this report do not match for all report suites. Only classifications that match exactly can be viewed and edited across report suites.
If it is smart enough to know that one or more report suites have a different classification, could it please indicate which report suite(s) are affected? Spending a lot of time on unraveling this mystery..