The 73rd Constitutional Amendment Act, 1992, which added Part IX (Panchayats) to the Constitution, mandates reservation of seats for Scheduled Castes (SCs) and Scheduled Tribes (STs) in Panchayats (Article 243D). However, the provisions of Part IX do not apply to certain states/areas as per Article 243M. Specifically, the 83rd Constitutional Amendment Act, 2000, inserted a proviso in Article 243M(3) stating that nothing in Article 243D relating to reservation of seats for SCs shall apply to the State of Arunachal Pradesh. This is because the State of Arunachal Pradesh has no Scheduled Caste population.