640. The parties must disclose to the arbitrator without delay any material change in the circumstances based on which a provisional or safeguard measure or a provisional order was requested or granted.
The arbitrator may amend, stay or revoke a provisional or safeguard measure or a provisional order on the parties’ request. In exceptional circumstances, the arbitrator may do so on the arbitrator’s own initiative but must, in compliance with the adversarial principle, invite the parties to make representations.