In a transaction subject to the reverse charge regime, in circumstances such as those in the main proceedings, Council Directive 2006/112/EC and the principle of fiscal neutrality do not preclude the recipient of the services from being deprived of the right to deduct the value added tax which he paid when that tax was not due to the service supplier on the basis of an incorrectly drawn up invoice, even where the correction of that error is impossible because that supplier is insolvent. The principle of legal certainty does not preclude an administrative practice of the national tax authorities whereby, within a limitation period, they revoke a decision by which they granted the taxable person the right to deduct value added tax and then, following a fresh investigation, order him to pay that tax together with default interest.