FI Period OB52

Hi

MMPV allows 1 month back posting, However OB52 every month opened "From Period" would be set to Current Period.

In this situation, how does the system allows to post on previous month ?

Is there a Practise "From Period" in OB52 can be set for Past 1 Period also, let us say current month is Aug'13 (period#08), possible to let be Jul'13 (period#07) ?

Regards

MM