How to change code in SAP Query

Hi Experts !!

In SAP QUERY I am getting the PO with all delivey dates & deliveried Qty but I have to select only single PO with latest delivery date & qty. If there r more than one record for latest delivery date than deliveried QTY must be sum of all QTY (for the latest delivery date). for example :

this is coming

Po delivery date qty

10001 30.06.2009 4

10001 30.06.2009 5

10001 01.05.2009 4

we want

Po delivery date qty

10001 30.06.2009 9

Thanks in advance.

Thanks & Regards

Navneet Singhal