(1) The Commission or the Chief of the Defence Force may, with the consent of the claimant, vary:
(a) an original determination made by the Commission or the Chief of the Defence Force that has been affirmed by the Board under Part 4; or
(b) a determination made by the Board under Part 4 in substitution for an original determination made by the Commission or the Chief of the Defence Force;
if the claimant has made an application to the Tribunal under Part 5 for review of the affirmed determination or the determination made by the Board and the review has not been determined.
(2) The Commission or the Chief of the Defence Force may, for the purpose only of correcting a manifest error, vary the date approved by the Board as the date from which a determination of the Board made in substitution for a determination of the Commission or of the Chief of the Defence Force is to operate.