(2) A certifying officer shall ensure, in respect of a claim for a payment included in a prescribed class of payments, that the payment—
(a) is for expenditure that has been duly approved; and
(b) is supported by a claim that identifies the head of expenditure to which the payment is chargeable.
(3) For the purposes of this regulation, each of the following classes of payment is a prescribed class of payments:
(a) payments in respect of which the head of administration or an authorised officer has certified—
(i) that the payments are based upon data prepared by a computer; and
(ii) that, in the preparation of that data, system controls and accounting procedures approved by the Minister have been employed;
(b) payments made by one administrative unit to another;
(c) payments in satisfaction of claims in respect of which the head of administration or an authorised officer has certified that a method of sample checking approved by the Minister for the purposes of this paragraph has been employed;
(d) payments in satisfaction of claims under contracts between the Territory and the claimants, being contracts under which the Territory has the right to make adjustments in relation to payments in satisfaction of subsequent claims by those claimants;
(e) payments in satisfaction of claims for payment of amounts not exceeding $1,000 in respect of supplies.