S. 147 : Reassessment-Carryforward and set off of brought forward losses-Business expenditure-Tax Audit Report-Provided all details in repose to notice-Provided break-up of head-wise expenses and these figures were also mentioned in statement of profit and loss filed by assessee, reopening of assessment being mere change of opinion was not justified. [S. 37(1), 72, 148, Art. 226]