Case C-271/12: Judgment of the Court (Second Chamber) of 8 May 2013 (request for a preliminary ruling from the Cour d’appel de Mons — Belgium) — Petroma Transports SA, Martens Énergie SA, Martens Immo SA, Martens SA, Fabian Martens, Geoffroy Martens, Thibault Martens v État belge (Taxation — Value added tax — Sixth Directive 77/388/EEC — Right to deduct input tax — Obligations of the taxable person — Possession of improper or inaccurate invoices — Omission of mandatory particulars — Refusal of the right to deduct — Evidence subsequent to the occurrence of the transactions invoiced — Correcting invoices — Right to refund of VAT — Principle of neutrality)