S. 263: Commissioner-Revision of orders prejudicial to revenue–Real estate business-Change in method of accounting from percentage-of-completion to completed-contract method-Change revenue-neutral, following Accounting Standards, verified by auditors and accepted in subsequent years-No loss to exchequer-Principal Commissioner’s directions to reconsider financial expenses, depreciation, current liabilities, deduction under section 80-IAB, house property income, loans and advances to related parties, etc.-Matters already examined by Assessing Officer-No indication of how order erroneous-Revision amounting to fishing and roving enquiries-Assessment order not prejudicial to Revenue-Revision quashed. [S. 2(22)(e), 80-IAB, 145]