Hi Anothai,
this is purely Notional amount to reflect and verify pricing of your Securities. E.g. if you have a price of 99,95 and 1000 units, it is evident that Cash flow-wise the Notional initial amount going to be 999.50. Otherwise, it is rather difficult for an average person to verify those Cash-flows.
In order to see real Cash flows of your deals, you should use 'Position cash flows' in FTR_CREATE.
I hope this will help.
Kind regards,
Renatas