S. 263 : Commissioner-Revision of orders prejudicial to revenue-Search and Seizure-Order passed after getting approval from Joint Commissioner-Order passed after examining the documents-Addition made on third-party based on documents and recorded statements-Third party order is not revised-Double taxation–Referred documents not of impugned assessment year or not belonging to assessee-Revision order is not valid. [S.133A 153A, 153B]