Total quanity not coming in a PO

Hi,

We are generaterating PO with reference to PRs. whose account assignemnt catagory is Q.

My problem is, when we are generating PO ,of a same material ,which have different line items because of different PR's having different account assignment WBS, i am not able to see the total quantity of that anywhere material in PO. I am only able to see the total value of the PO but not quantity,

How can i get the total quanitity of material in PO?

Regards,

Kalpesh