If:
(a) at any time during the Tribunal's review of a decision, a document that is relevant to the review comes into the possession or under the control of the decision - maker; and
(b) the document has not been given to the Tribunal for the purposes of the review;
the decision - maker must give a copy of the document to the Tribunal within 28 days after the day on which the document came into the possession or under the control of the decision - maker.