I have an instructor who is grading a forum by rating students' posts. (Only the instructor has permission to rate.) It was set to a maximum grade of 10, but she wanted it changed to a maximum grade of 6. She requested this change after she'd already rated students. Now, when I try to change the maximum grade, I get the error(s) shown in the attachment. They seem to contradict one another: one says I can't change the maximum grade, and the other says I can change the maximum grade after rescaling. I don't even see anywhere to rescale the grades. How can I change the maximum grade for this forum?
