Hi,
Hope you aware that, For any material ,you want quality Inspection first..there is two method.
First is : You have to ticked Post to insp. Stock in Purchasing view or enable Quality View in Material Master (MM01/MM02),then always material go for Quality Inspection stock while GOODS Receipt.This is good for raw materials or other material that you want always material go for quality testing before go to Unrestricted stock.
Second is : Suppose you want particular material to go for quality inspection.Not required all time .In this case while making PO you have to Select Stock Type "Quality Inspection" in Delivery tab in Item Detail.
Please check your material in material master or in respected po for Quality Insp.