Revised return- meaning of bonafide

Dear Friends,

In the original return, the sales disclosed is around 9 lacs. After the return was filed within the due date,  there is a rectification in the sales & purchase figures.The sales fig reached to 12 lacs. The income disclosed is unchanged. Whether such change is bonafide. if not what is the remedy in such a case.

Can i file a revised return without attracting penalty?

Regards

Indranil.