Dematerialisation requirement for shifting from trade-for-trade to rolling settlement; certificate from agent required and exchanges must report. Companies connected to both depositories may be shifted from Trade-for-Trade to normal Rolling Settlement only if at least fifty percent of other-than-promoter holdings are dematerialised, certified by the Registrar and Transfer Agent or, where no separate RTA exists, by a practicing Company Secretary or Chartered Accountant, and provided there are no other grounds for continuation of TFTS; stock exchanges must report the action taken in their periodic development reports.