Opinion of Advocate General Bot in the case Senatex. Articles 167, 178(a), 179 and 226(3) of Council Directive 2006/112/EC of 28 November 2006 must be interpreted as precluding national legislation such as that at issue in the main proceedings under which the correction of an invoice in relation to certain required details, namely the VAT identification number, does not have retroactive effect, with the result that the right to deduct VAT may be exercised only for the year when the initial invoice was corrected and not for the year when that invoice was drawn up. In this regard, the Member States may adopt measures to penalise failure to provide the required details, as long as they comply with the principle of proportionality, and also measures placing a temporal restriction on the possibility of correcting an incorrect or incomplete invoice, provided they apply in the same way to similar rights in tax matters based on domestic law and to such rights based on EU law (principle of equivalence) and do not render impossible in practice or excessively difficult the exercise of the right of deduction (principle of effectiveness).
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