Clearing corporation guarantee for commodity derivatives now mandated to ensure settlement and good delivery under amended regulations. The amendment requires a recognised stock exchange that enters arrangements with multiple recognised clearing corporations to execute a multipartite written agreement ensuring interoperability, and inserts Regulation 43A obliging every recognised clearing corporation clearing commodity derivatives to guarantee settlement of trades, explicitly including good delivery, defined as delivery in proper form to transfer title and meeting contract quality and quantity specifications. Certain amendments are deemed effective from October 3, 2018.