S. 263 : Commissioner-Revision of orders prejudicial to revenue-Purchase of immovable property-Below circle rate-Sale consideration and DVO-determined FMV for assessee’s share was within permissible 10 per cent variation-CBDT Circular No. 8/2018-Revision by PCIT treating variation as taxable and Circular as prospective was an unsustainable, change of opinion not supported by law-Revision order was quashed. [S.50C, 56(2)(viib), 143(3), 147]