"138A. Caveats to which sections 138B to 138D apply
A caveat that has not been lodged -
(a) under section 30, 176 or 223A;
(b) by or on behalf of a beneficiary claiming under a will or settlement;
(c) under a court order;
(d) by the Registrar on the direction of the Commissioner;
(e) under any written law other than this Act;
(f) under any Commonwealth Act; or
(g) by or on behalf, or with the consent, of the Minister for Lands,
is a caveat for the purposes of sections 138B to 138D.
138B**. Certain caveats may lapse unless justified by caveator**
(1) If a section 138A caveat has been lodged then the proprietor of the land in respect of which the caveat was lodged may apply, in an approved form and on payment of the prescribed fee, for the Registrar to serve the caveator with a notice to the effect that, unless the caveator takes the action referred to in subsection (2) within 21 days after the day on which the notice is served, the caveat will lapse.
(2) If the notice referred to in subsection (1) is served on the caveator then the caveat lapses 21 days after the day on which the notice was served unless, before that time, the caveator has -
(a) obtained from the Supreme Court an order extending the operation of the caveat -
(i) for such further period as is specified in the order; or
(ii) until the further order of the Court;
and
(b) lodged with the Registrar a copy of the order."