wrong purchase order item in inspection lot record

we have a purhase order in which item no. 1 & 2 have the same material code .

GR has been done against item no. 2 in MB01. Also the usage decision has been done

in QA11 for the inspection lot no. generated. Now when we see the purchase order data in

inspection lot in qa13 the value in purchase order item no. is 1,whereas the GR has been

done against item no. 2.

Please tell why the inspecton lot is picking wrong reference of Purchase order item.