Well, at the time of development we didn't have necessity in deleting grade items, because all of them were created by course activities, so this feature just wasn't implemented
Thanks 
Well, at the time of development we didn't have necessity in deleting grade items, because all of them were created by course activities, so this feature just wasn't implemented But thanks to the plug-in structure, adding new action is quite simple, so if you do need it, I could help you out with this - code for deleting grade items was not so difficult as I remember...
Well, at the time of development we didn't have necessity in deleting grade items, because all of them were created by course activities, so this feature just wasn't implemented