Amendment of the fourth Schedule to the Constitution. "43A. Certain orders shall cease to have effect after specified period.The IV Amendment decreed the seats for minorities and non-Muslims representation to the government of Pakistan and the Parliament of Pakistan. This Edition, which is intended to provide an updated version of the Constitution, incorporates all amendments made in it till date. An amendment to the 1973 Constitution of Pakistan. The 1956 constitution provides for Parliamentary form of government with all the executive powers in the hands of Prime Minister. (1) There shall be a President of Pakistan who shall be the Head of State and shall represent the unity of the Republic. The document guides Pakistan's law, political culture, and system. Constitution (Eighteenth Amendment) Act, 2010. (2). Election to fill seats in the Senate allocated to each.