Posting here as it seem seems suitable. In moodle 2.2.3 there seems to be 2 states for the edit icon. I had to double click mine to open the get to the different checkboxes that applied to the particular assignment like clearning the overridden flag. Clicking it once only got me a text area to enter a quick grade. If you encounter problems getting to the overridden flad consider disabling quick grading and then double clicking the edit icon for the grade you want to change
Gradebook
Manually grading an Activity
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