trying to delete values for a specific attribute across all activities. i have used activity+attribute (matrix cat)+fc=d in change only mode. i have used activity+attribute (matrix cat)+ current value+fc=d in change only mode. i have used activity+attribute (matrix cat)+fc=d in delete only mode. i have even tried to change the values to null using activity+attribute (matrix cat)+ blank cell for value+fc=c in change only mode.
also, i have tried using "position to" for this change as well, with no luck.
any advice would be appreciated.