16In accordance with that principle, the first subparagraph of Article 11C(1) of the Sixth Directive defines the cases in which the Member States are required to ensure that the taxable amount is reduced accordingly, under conditions which are to be determined by the Member States themselves. That provision therefore requires the Member States to reduce the taxable amount and, consequently, the amount of VAT payable by the taxable person whenever, after a transaction has been concluded, part or all of the consideration has not been received by the taxable person.
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