If the Designated Authority determines that:
(a) an approval the Designated Authority grants to a person to prospect for petroleum, or to undertake petroleum activities, in the JPDA; or
(b) a production sharing contract the Designated Authority enters into with a person;
is to be taken to have had effect on and from 20 May 2002, the approval or contract is taken, for the purposes of this Act, to have had effect on and from that day.