S. 147 : Reassessment-After the expiry of four years-Set off the losses incurred in one unit against the profits of the other unit-Audit objection-Change of opinion-Notice and consequential proceedings quashed-Circular No. 7/DV/2013 dated July 16, 2013 (2013) 356 ITR (St.) 7).[S.10A, 10AA, 148, 151]