@dave indeed you can't pull class with reports, what I've done to get classes was a custom field, I can't remember exactly the properties but I think it is updated after submit by a workflow, or it is just a source field, don't know, the fields you can't put on reports you have to create mirror fields, for example: preferred supplier, it is another field you can't put on reports, but after you get the idea you pretty much can put everything to work with reports