Ageing report requirement

HI

I have requirement in Ageing Report

Example:

01/09/2013 we have a vendor  invoice of 1000 & 05/09/2013  we paid 500 rs

As per ageing report if we take ageing of

Ageing 0f 01-03.............03/05/2013

..............   1000.............. (-500)

Our report is showing like above now our client want to see ageing report on below example

Example:

01/09/2013 we have a vendor  invoice of 1000 & 05/09/2013  we paid 500 rs

As per ageing report if we take ageing of

Ageing 0f 01-03.............03/05/2013

..............   1000.............. (-500)

Instead of above report they want to see like below

Ageing 0f 01-03(same document number).............

..............   500..............

Kindly provide me a solution for the above problem

Regards

Ajeesh.s