For an overview of the differences between grading an assignment directly via the gradebook and assigning the grades within the assignment activity itself, check this article: Grading Student Assignments.

How to tell whether a grade has been overridden:

1. Go to the Grade administration page by clicking on Grades in the course header, near the top of the page.
   
   
   
   
2. Once you are on the Grade administration page, make sure you are in the Grader report tab, under the View tab. Look for the affected student - if the grade indicated for the assignment is contained within a peach-coloured cell, the grade has been overridden.
   
   
   
   

You can remove a grade override and re-enable your ability to upload a response file or complete other grading activities. But removing an override will restore the grade assigned in the Assignment activity. For example, if you originally gave a student 8/10, but then changed their grade to a 9/10 in the gradebook override, removing the override will revert the grade to 8/10. It is strongly recommended that if you do need to edit a student's grade, you do so within the Assignment grading area itself, rather than via the gradebook.

Re-enable your ability to grade assignments:

1. In the gradebook, click turn editing on by clicking Edit mode  in the top right corner of the page.
   
   
2. Once edit mode has been activated, click on the gear icon contained within the peach-coloured cell corresponding to the affected student.
   
    
   
   
3. In the 'Edit grade' page that opens, remove the checkmark from the 'Overridden' check box, then scroll to the bottom of the page, and click Save.
   
    
   
   
4. The student’s grade will no longer be in a peach-coloured cell, and the grade will have reverted back to the initial grade given to the student. The ability to upload response files or perform other grading activities in the Assignment activity should now also be restored. Keep in mind that you will also need to re-assign the updated grade from within the assignment activity.