(1) If a plan has been approved and notified for a plan area (even if the plan or a part of the plan has not taken effect in respect of that area), then the Commonwealth, the Trust and other Commonwealth bodies must act in accordance with the plan in carrying out activities in that area.
(2) However, this section does not authorise or require the Commonwealth, the Trust or the Commonwealth body to carry out an activity that it is not otherwise legally able to carry out.