GR happens more than PO ,qty is not effect in UD

Hi Every one,

i have one PO with order qty is 100.Goods Recipt happend with quality and batch created with 100qty .Then did mvt 102 agianst POwith 100qty.

Again GR happend  120 qty with same PO.same batch is created to new GRN also.

Inspection lot getting with First GRN qty.in case UD the qty is getting 100.it should be 120 as per new GR.

why it happens and how can i make this with 120 qty in Inspection lot.

The First GRN : Status GR Doc is :1

The Second GRN:Status GR Doc : 6