(6) Nothing in this section affects the operation of the provisions of this Act to the extent that they give effect to an international maintenance arrangement. (legislation.gov.au)
Nothing in this section limits a parent's ability to agree to provide additional support or the court's power to inquire whether an agreement to provide additional support has been made. (law.stackexchange.com)
(4) Nothing in this section renders the person liable to be punished twice in respect of the same act or omission. (legislation.gov.au)