S. 263 : Commissioner-Revision of orders prejudicial to revenue-Appeal before Commissioner (Appeals)-Issue was not subject matter of appeal before Commissioner (Appeals)-Book profit-Revision is valid-Revisionary order passed by Commissioner under section 263 could not be said to be without jurisdiction merely because document identification number (DIN) of order was intimated one day after said order was passed. [S. 9(1)(vii), 115JB, 250, 263(1)(c), Art. 226]