Assessment status modification expands tax notification power to specify assessment categories for business income. Amendment permits modification notifications under Section 293A to address the status in which a class of persons or their members are to be assessed on income from the specified business; the insertion and a substituted Explanation (defining 'mineral oil' to include petroleum and natural gas and defining 'status' as the assessment category such as individual or Hindu undivided family) are deemed effective from 1 April 1993, and a proviso allows notification effects to commence from an assessment year beginning on or after that date.