S. 263 : Commissioner-Revision of orders prejudicial to revenue-Assessing Officer has properly verified issues during original assessment-Expenditure on exempt income-Query raised in the course of assessment proceedings-Reply filed-Employment of new employees-In continuation of earlier years-Revision is not valid-Revision order is quashed-Revision on issue not included in notice-Revision is beyond scope of notice and not permissible. [S. 14A,80JJA, 143(3), R.8D]]