S.263: Commissioner – Revision of orders prejudicial to revenue – Non-performing assets – Loss on sale of NPAs – Co-operative bank – Assessment completed under section 143(3) after examination of relevant details – AO having adopted a possible view – Loss on sale of NPAs held allowable as business loss by the Tribunal in the assessee’s own case – PCIT could not invoke revision merely for directing fresh enquiry or substitute his view for the view taken by AO – Revision order quashed. [ S. 2(14), 143(3), 144B .]