Penalty procedure: penalty orders may follow appellate or revisional assessment revisions, subject to hearing and a six month limit. Amendment permits penalty orders-imposition, enhancement, reduction, cancellation or dropping of proceedings-to be made on the basis of assessment as revised by appellate or revisional orders, subject to the assessee being heard and a six month time limit from the month-end when the appellate order is received or the revisional order is passed; subsection (2) of section 274 applies to such penalty orders.