An omission to do an act can only be a physical element if—
(a) the law creating the offence makes it a physical element; or
(b) the law creating the offence impliedly provides that the offence is committed by an omission to do an act that there is a duty to do under a territory law or a law of a State or the Commonwealth.
Note Law , of the Territory, includes the common law (see Legislation Act
, dict, pt 1).