Capturing last PO change date

Hi,

I want to capture the PO changes date into my view where as I will consider only one rows with last change date as highlighted below into my graphical calculation view .

Example

     PO -      item -     changedate -      time

     1000     10          20150623           1:00:00

     1000     10          20150623            2:00:00

     1000     10          20150624            1:00:00

is there any option using any calculated column / expression in graphical view without Script view for getting one row.

This report is already running & using by user, just new field addition .

Regards,

Kamruz