22 October 2014
Revised return can be filed upto one year from the end of assessment year. In your case, since the return has already been processed, filing a revised return is an option procedurally. If you can clarify what made you arrive at conclusion that ITR -2 was to be filed, I can advise better.
22 October 2014
you may file revised return as suggested by Mr Mehta...otherwise, just leave the return as it is and ensure that the mistake is not repeated in future.