S. 263 : Commissioner – Revision of orders prejudicial to revenue – Special category States – Manufacture of essential oils and perfumery -Assessment without incriminating material – Search assessment – Deduction u/s 80IC – Revisionary power cannot be exercised in respect of completed/unabated assessments in absence of incriminating material – Revision order quashed. [S. 80IC, 132, 143(3), 153A, 153C , 153D]