Transaction FJA1 or program J_1AINFG

Hi All

I ran the transaction FJA1 to the period = 2 .

Transaction calculated Inflation Adjustment for account according balance month: January only.

I believe it´s right

However , I have a doubt:

When I ran transaction : FJA1 to the period = 3

Program J_1AINFG or FJA1 transaction , calculated Inflation Adjustment to the acount for both month: January and February together.

So, balances (january and february) were accumulateds to calculate inflation to the period 03.

Shouldn´t be calculated only for balance regarding period 02?

Thank you very much

Sandro Citadini