34However, although the German version of that provision is ambiguous on that point, it is apparent from the French and English versions of the Sixth Directive that the deduction referred to in Article 17(2) thereof must be made in respect of the tax period in which the two conditions required under the first subparagraph of Article 18(2) are satisfied. In other words, the goods must have been delivered or the services performed and the taxable person must be in possession of the invoice or the document which, under the criteria determined by the Member State in question, may be considered to serve as an invoice.
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