No, I meant the whole grouping does not consider the class.
I have for example 7 classes in one material. SAP did not ask me to select a specific one of these seven classes. It just gives me all characteristics from all classes to choose from for my grouping.
Just try it. Create a new class and add a characteristics that belongs to a group
and add another characteristic that is not in the group.
I expect 2 tabs, one General and one with the group name.