(1) An arbitration determination must state, as its nominal expiry date, a date that is—(a) agreed by the negotiating parties or, if the parties can not agree, ordered by the commission; but(b) no later than 4 years after the date on which the determination is made.
(2) The arbitration determination has effect subject to any conditions stated in the determination.
(3) The arbitration determination operates until it is terminated under part 7 , division 3 .
(4) While the arbitration determination operates, the determination—(a) prevails, to the extent of any inconsistency, over an award or an order made under section 136 ; and(b) can not be amended.