Securities - Nominal Amount

Hi,

This is the cashflow for Product Type 04R.

On 15.12.2015 I Purchase 750 USD of Nominal Amount at 100 % .

I did this because the Security has already payed 250 of Capital and now the bond values 750. All Purchase is done at 100% but it changes the Nominal Amount depending on the Capital repayed.

For Statutory Reporting they would like to know the Nominal Amount if the Purchase was at the begining of the Cashflow. In this example it would be 1000 USD at 75% (the cashflow has got 4 Amortizations).

Any ideas how to achieve this ?

Kind Regards