What is the constitutional provision relevant for solving the questions of repugnancy between a Central law and a State law?

According to Article 254(1), if any provision of a State law is repugnant to a provision in a law made by Parliament which it is competent to enact, or to any existing law with respect to one of the matters in the Concurrent List, then the Parliamentary or the existing law prevails over the State law, and it does not matter whether the Parliamentary law has been enacted before or after the State law. To the extent of repugnancy, the State law is void.