S. 263 : Commissioner-Revision of orders prejudicial to revenue-Bogus accommodation entries-Revision on the basis of roving enquiries-CBDT circular on no set-off of loss against deemed income u/s 115BBE applicable w.e.f. 1st April 2017-Invocation of section 263 jurisdiction by the Ld. CIT is invalid-Income assessed remains same even pursuant to revision-Revision is not valid. [S. 56, 68, 115BBE, 143(3)]