(1) Where the Central Government is satisfied that it is necessary so to do in the public interest, it may, by notification in the Official Gazette, amend the First Schedule:

Provided that such amendment shall not alter or affect in any manner the rates specified in that Schedule in respect of goods at which duties of customs shall be leviable on the goods under the Customs Act, 1962. (52 of 1962).

(2) Every Notification issued under sub-section (1) shall be laid, as soon as may be after it is issued, before each House of Parliament, while it is in session, for a total period of thirty days which may be comprised in one session or in two or more successive sessions, and if, before the expiry of the session immediately following the session or the successive sessions aforesaid, both Houses agree in making any modification in the notification or both Houses agree that the notification should not be issued, the notification shall thereafter have effect only in such modified form or be of no effect, as the case may be; so, however, that any such modification or annulment shall be without prejudice to the validity of anything previously done under that notification.