How to claim losses in f&no commodities trading along

Hi All,

I a working in a private job and get Form-16 from my company for tax filing.

I do some trading in commodities( F&O). I incured fair amount of loss (around 2 lack) in the financial year of 14-15. I somehow missed to claim these losses in the same financial year while filing my return.

My question to experts here is, can i file a corrective return for year 14-15 to put these losses in that financial year or can i file these losses into current financial year 16-17? Since i have already filed my return for 15-16.

Please let me know. I am based out of Pune.

Thanks
Sachin