Case C-622/23, rhtb: Judgment of the Court (Seventh Chamber) of 28 November 2024 (request for a preliminary ruling from the Oberster Gerichtshof – Austria) – rhtb: projekt gmbh v Parkring 14-16 Immobilienverwaltung GmbH (Reference for a preliminary ruling – Common system of value added tax (VAT) – Directive 2006/112/EC – Article 2(1)(c) – Scope – Taxable transactions – Contract for services for the carrying out of a building project – Termination of the contract by the customer – Concept of remuneration – Characterisation – Obligation to pay the total amount agreed after deduction of the costs saved by the supplier – Article 73 – Taxable amount)