How to add Total Quantity in Inbound and Outbound Delivery screen

Hi,

I want to add Total quantity field in Inbound and Outbound Delivery screens.

In document flow i can see the line item quantities in ALV Format, but if i select Display the totals above the entry check box

in Change Layout--> Display, i didn't see any totals displayed.

Please help me on this?

Regards

Bhuvana