S. 49 : Capital gains-Previous owner-Cost of acquisition-At time of filing of return of income on 30-9-2009, sub-clause (e) to section 49(1)(iii) was not in statute as same was inserted by Finance Act, 2012, with retrospectively effective from 1-4-1999-Provision cannot be applied for computing the capital gains of relevant year. [S. 45, 47(xiii)]