S. 147 : Reassessment-After the expiry of four years-CSR expenditure-Prior period gain /loss-No failure to disclose material facts-Provision of Explanation 2 to section 37(1) inserted with effect from 1st April 2015 operates prospectively, from assessment year 2015-16-Reassessent notice and order disposing the objection was quashed. [S. 37 (1), 148 Art, 226, Companies Act, 2013, S. 135]