Second Invoice PLD should have value of First Invoice with same SO

Hi All,

The scenerio is as such a Sales Order is created for the value of 1000. Now based on this sales order a partial invoice No 1 is created for 500. Again after somedays based on the same sales order another invoice No 2 is created for 300. Now in the Invoice No 2 prinout I want that Invoice Number 1 value which is 500 should also come.

How to achive this in PLD.

Regards,

Kawish