A payment claim under s 13(1) of the Building and Construction Industry Security of Payment Act 1999 (NSW) can only be validly served on a person who is a party to the relevant construction contract. A defence that the defendant is not a party to the construction contract is not a defence 'in relation to matters arising under the construction contract' within s 15(4)(b)(ii), and is therefore not foreclosed by that provision. The question of whether the definition of 'construction contract' extends to restitutionary claims was left open.
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