The Full Court held that the decision embodied in the certificate was made under the Commonwealth Act and the scheme, notwithstanding that it was also made under the State Act. With all respect, we cannot agree. The appellant derived his authority to give the certificate in question from the State Act and from no other source. He was, as the scheme envisaged, appointed under the State Act to be an authorized officer, and the power which he exercised was conferred on him by s. 8(3) of that Act. The certificate derived its legal efficacy to impose a legal liability on the distributor entirely from the State Act, and in particular from s. 10. No action taken under the Commonwealth Act or under the scheme could either strengthen, or detract from, the force of the certificate under s. 8(3). The State Act of course proceeds on the assumption that there was in force a scheme by reference to which the amounts payable should be ascertained and an authorized officer, in giving a certificate, would be bound to consult the scheme and to ascertain the amounts payable in accordance with the scheme. However, although the scheme would give the authorized officer authoritative guidance, it did not give him power or authority to make the decision to issue the certificate and it was not the legal source of the rights and liabilities which the certificate created and imposed. Finally, the certificate issued by the appellant purports to have been issued under s. 8(3) of the State Act and closely follows the words of that section, which although similar to are not the same as those of cl. E2(5) of the scheme. The issue of the certificate might have a practical effect on the rights and liabilities of the Commonwealth and the State inter se as measured by the scheme: it might lead to a repayment by the distributor to the State, and thereby affect the adjustment of accounts between the Commonwealth and the State pursuant to ss. 3 and 11 of the Commonwealth Act and cl. E7 of the scheme, but that does not mean that it was issued under the scheme. When neither the Commonwealth Act nor the scheme is the source of the power to appoint the decision-maker, or the source of his power to make the decision, or the source of the decision's legal effect, it cannot be said that the decision was made under that enactment. For these reasons, we find it impossible to say that the certificate was issued under the authority, or in pursuance, of the Commonwealth Act or the scheme, or that it represents or embodies a decision made under the Commonwealth Act or the scheme. It was issued entirely under the State Act. It was not a decision "under an enactment" within the Administrative Decisions (Judicial Review) Act, and it follows that the objection to the competency of the application was rightly upheld by McGregor J.