Vendor assigment to be deleted in MAss from inspection plans

Dear All,

I am stuck up at one point.We want to remove Vendor assigned from Number of Inspection plans having Multiple counters and multiple materials.It is not getting recorded in LSMW,as if I take criteria of Group number ,plant  number and group conter then it may have mutile materials out of which some may have Vendors and some may not have.I was also trying to do by  "CWBQM but not able to find vendor column so that I can change that in mass to blank.BDC will need further help from ABAPER .Pl advise in someway so that I can do same through CWBQM.

Thanks in Advance

REgards