What is the significance of the amendments mentioned in this context?
The amendments mentioned in this context primarily focus on revising the powers and jurisdiction of certain authorities and institutions, particularly those related to the investigation of issues concerning Scheduled Castes. Some key changes made by these amendments include:

1. (Amendment) Act, 2003, s. 2 (w.e.f. 19-2-2004): This amendment omitted references to "Scheduled Tribes" from the text, indicating a change in the scope or focus of the provisions related to Scheduled Castes.

2. Clause (3) renumbered as clause (10): This renumbering was made by the Constitution (Sixty-fifth Amendment) Act, 1990, s. 2 (w.e.f. 12-3-1992). The significance of this change is not immediately clear from the context provided, but it may have been a reorganization or rearrangement of clauses to better reflect changes in the law or policy related to Scheduled Castes.

These amendments likely had significant implications for the policies and procedures governing the investigation and handling of issues concerning Scheduled Castes and possibly other marginalized communities as well, given the omission of "Scheduled Tribes" from the text.