A demand under s 10(2)(a) of the Workmens Liens Act 1998 (NT) must correctly identify the contract price; inclusion of amounts that are not contract price (such as claims for conversion or detinue) renders the demand invalid. A contractor who discontinues an action to enforce a registered lien without obtaining a court order under s 16 cannot avoid the consequences of that section by asserting that its own notices were defective. The expression 'has registered a lien' in s 16 is not confined to valid registrations.
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