(1) After the commencement of a proceeding in the Tribunal's review jurisdiction about a decision, the decision maker must not:
(a) vary the decision; or
(b) set aside the decision and substitute a different decision.
(2) However, the decision maker may do so if:
(a) the relevant Act permits; or
(b) the parties to the proceeding consent to the variation or setting aside and substitution; or
(c) the decision maker is invited to reconsider the decision under section 49.