The intention to make a motion in the Union Legislature for an amendment of the Constitution shall be notified to the public and such motion shall not be taken up for consideration by the Legislature until the expiry of at least six months from the date of such notification. It shall not be deemed to have been approved by the Union Legislature unless it has secured the support in each of the two Chambers of a majority of not less than two-thirds of its sanctioned strength. Further, Such amendment shall not have effect unless it is also approved by the Legislatures of not less than two-thirds of the Units:Provided that no amendments shall be made at all for a period of five years from the coming into force of the new constitution in respect of vital provisions of the constitution which should be listed in a schedule to the Constitution Act.