Interesting problem. Well, REV02 which appears to the module your using only has one line item and it's a calculated line item so it can't be edited anyway. Although, you shouldn't be prevented from toggling to make it editable - I can't seem to repeat that problem. If you really want to edit the data I would suggest using DATA02 but that's at SKU level.
Try rebuilding the worksheet by using a custom view (not a saved view) and see if that helps.