Material modification restrictions require trustee and stock exchange approval before altering securitized debt instrument terms. Listed issuers must obtain trustee approval before applying to the recognised stock exchange(s) for any material modification to securitized debt instrument terms; ensure timely interest and redemption payments; maintain any provided credit enhancement at all times; transfer unclaimed interest and principal to the investor protection and education fund after the prescribed dormant period; effect redemptions on a pro rata basis or by lot unless otherwise provided and promptly disclose selection details; and remain listed until maturity, redemption or formal delisting, subject to exchange authority to delist or suspend.