Hi Ripon.
Your scenario is ON Hana? or you just activate some accelerators?
In CO there are some new tcodes. Check this link:
http://wiki.scn.sap.com/wiki/display/ERPFI/HANA+FI-CO+and+CO-PA+Accelerators
In my current project the primary persistant database is HANA. Indeed, from the end user point of view, there is no difference. You only see the new tcodes and feel some performance improvement.
My recommendation is test your typical user flow (Cost center period end, Assesments, distributions, ML Close.. whatever you have in your system). And validate everithing run well.
Arturo.