S. 263 : Commissioner-Revision of orders prejudicial to revenue-Duty entitlement Passbook (DEPB)-Book profit-Provision made for doubtful debt and corporate Debt restructuring-Failure to deduct tax at source-Short deduction of TDS-Revision was quashed-Other issues Revision was held to be valid. [S.37, 40(a)(ia)), 115JB, 145]