D and a Property Group Pty Ltd v Sonar Investment Pty Ltd (No 3)

The case of D and a Property Group Pty Ltd v Sonar Investment Pty Ltd (No 3) involved a dispute concerning the interpretation and calculation of a settlement agreement. The parties had entered into an agreement to settle their differences, which included a provision for the payment of a sum of money by one party to the other. The dispute arose from the calculation of this amount, with D and a Property Group Pty Ltd asserting that Sonar Investment Pty Ltd had failed to make the correct payment. The case was heard in the Supreme Court of New South Wales.

The primary legal issue before the court was whether the settlement agreement contained a mathematical error in the calculation of the payment amount. D and a Property Group Pty Ltd argued that the agreement was clear and unambiguous and that the payment was calculated incorrectly. Sonar Investment Pty Ltd, on the other hand, contended that the court should not vary the terms of the settlement agreement and that any error was due to a mistake made by D and a Property Group Pty Ltd in their calculations.

The court found that the settlement agreement was clear and unambiguous in its terms. However, it also determined that there was a mathematical error in the calculation of the payment amount. The court applied the principles of the slip rule, which allows for the correction of errors in judgments and orders, to permit the amendment of the settlement agreement to correct the error. The court held that the error was apparent on the face of the settlement agreement and that it was necessary to correct it to give effect to the true intention of the parties.

The court's decision resulted in the amendment of the settlement agreement to correct the mathematical error in the calculation of the payment amount. The court found that the error was apparent on the face of the agreement and that it was necessary to correct it to give effect to the true intention of the parties. The court's decision provided clarity and finality to the dispute between the parties and ensured that the settlement agreement was implemented as intended.