For a discussion forum, I set the Aggregate type to "Sum of ratings" and the Scale to 100. For a student, I gave 100 his first post and 50 to the second post, so the sum of ratings should be 150 in total. But it seems like the max grade is locked to 100. In the grading categories and items view, it shows the forum max score is 100. Is there a way I could change the max score of a forum activity? I have tried the custom scales but it would not work for the sum of ratings option.