The Court held that the amount claimed in a payment claim under the Building and Construction Industry Security of Payment Act 1999 (NSW) is as much a part of the 'scope' of the payment claim as the nature of the work, and its determination is a matter for the adjudicator — a reasonable but erroneous interpretation does not constitute jurisdictional error. Where a payment claim included cumulative amounts to date (including an unpaid prior progress claim), the adjudicator was entitled to interpret the total amount shown in the claim as the claimed amount, even though the front page stated a lesser net figure. The procedural fairness challenge failed because, applying Demex, no substantial practical injustice arose where the claimant was entitled to both the disputed and undisputed amounts regardless of the adjudicator's interpretive approach.
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