Article 144 in conjunction with Article 86(1)(b) of Council Directive 2006/112/EC must be interpreted as precluding national legislation such as that at issue in the main proceedings which requires, for the application of an exemption from value added tax for ancillary services, including transport services, not only that their value is included in the taxable amount, but also that value added tax has in fact been charged on those services at the customs stage at the time of importation.