Scenario: An instructor has a standard forum (general use) and grading using forum ratings.

They mistakenly rated a student's post and then wanted to delete the rating.

They should be able to set the rating back to "Rate..." which sends a null value of "-999".

This visually appears to reset the rating on the forum page (post says "Sum of Ratings: - "). However, there must be a data table that doesn't get updated correctly because the grade table keeps whatever the last non-null value and is viewable in the grader report and single views.

To Reproduce:

• Setup a forum with ratings
• Make a few posts with a student role
• Rate the students post.
• Attempt to remove the rating by setting back to "Rate..." (null)
• Navigate to the single view grade book for the activity.
• The value persists even though a null rating value is correctly recorded in the forum.
• Edit Forum settings > Scroll to Ratings. Note that you can't update the forum rating settings because a rating still exists.