I set off derivatives loss against interest income from bank, FDs, NSC and debentures. This was rejected by CPC Bangalore saying that set off of specualtion loss against non speclation business income is not allowed. However I found at many websites that "trading in derivatives (futures and options) is treated as non-speculation business even though delivery is not effected in such transactions". With this appreciate any help on how to rectify this return and submit to CPC?