In the Northern Territory, s.48 of the Workmen's Liens Act 1893 prevents the creation of any workmen's lien against a Crown Lease granted under the Crown Lands Act, because land held under Crown Lease remains 'land vested in Her Majesty' given the current definition of 'Crown lands'. This differs from the position in South Australia where the definition of 'Crown lands' excludes leased lands. Section 10(2) exclusively provides the mechanism by which monies 'become due' for the purposes of s.10(1), and where a contract requires a Progress Certificate, monies do not become due until the certificate issues.
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