I did that and now the affected threads show 'Average N/A%' for ratings of both the entire thread as well as for individual members who have voted in that thread. Also all rating fields are no longer visible when users try to rate.
updates: ok, i tried to create a new rating set with the same number of fields (4 fields) and assigned it to the type. No difference. And when I try to edit the ratings, the author's rating is back to 0,0,0,0 and still not deleted. BUT the ratings in the forumdisplay is right! Only in the threadbit, everything is quite screwed. Pls help urgently as no one can vote now. Tks.
more updates: If i set the rating set back to allow N/A, it displays fine. But I don't want to allow N/A, any solution?