i am make any assy.after assy when i am make drg from assy. i am a create bill of material. after i want to add all description by manuallyin bill of material because all bill of material is get data from part name given by ERP. but when i am fill up the bill of material manually after given auto ballon. than add ballon no but when i am change any thing in number in bill of material also effect. i am allready brake the relation between BOM and drg. i am attatched drg for this problem. please help me for better result.