Judgment of the Court (Sixth Chamber) of 8 June 2000 in Case C-396/98 (reference for a preliminary ruling from the Bundesfinanzhof): Grundstückgemeinschaft Schloßstraße GbR v Finanzamt Paderborn (Turnover taxes — Common system of value added tax — Article 17 of the Sixth Directive 77/388/EEC — Deduction of input tax — Deduction precluded by an amendment to national legislation removing the possibility of opting for taxation of the letting of immovable property)