S. 115BBE : Tax on income referred in S 68, 69, 69B, 69C, S69D-Set off of loss-Survey-Surrender of income-Set off of losses was to be allowed-The amendment made to section 115BBE denying the benefit of set off of losses with effect from 1-4-2017 was retrospective in nature. [S. 68 to 69C, 71, 115BBE, 133A]