A scope order in relation to a proposed bargaining instrument—
(a) takes effect on the day the order is made; and
(b) continues in force until the earliest of the following times—(i) if the order is revoked by the commission—the time stated in the instrument revoking the order;(ii) when the proposed bargaining instrument is certified or made by the commission under part 5 ;(iii) when an arbitration determination covering the employees stated in the scope order is made;(iv) when the negotiating parties agree the negotiations have ended.