What is the significance of the Act, 2003 mentioned in this context?
The significance of the Act, 2003 mentioned in this context is that it amended Article 338A of the Indian Constitution. This amendment introduced changes to the functioning of the National Commission for Scheduled Castes and Scheduled Tribes (NCSC), which was later split into two separate commissions - the National Commission for Scheduled Castes (NCSC) and the National Commission for Scheduled Tribes (NCST). The Act, 2003 came into effect on February 19, 2004.