Contract number: [ complete ]  Contract conditions of December 2015  The contractor must take all appropriate measures to minimise costs, prevent damage and  cancel or reduce its commitments. Within 60 days of the date of termination, the contractor must submit any report and any  invoice required for supplies that were provided before the date of termination. In the case of joint tenders, the contracting authority may terminate the contract with each  member of the group separately on the basis of points (d), (e) or (g) of Article II.17.1,  under the conditions set out in Article II.11.2.  II.18. INVOICES, VALUE ADDED TAX AND E-INVOICING  II.18.1. Invoices and value added tax  Invoices must contain the contractor’s (or leader’s in the case of a joint tender)  identification data, the amount, the currency and the date, as well as the contract reference.  Invoices must indicate the place of taxation of the contractor (or leader in the case of a  joint tender) for value added tax (VAT) purposes and must specify separately amounts not  including VAT and amounts including VAT.  The contracting authority is exempt from all taxes and duties, including VAT, in  accordance with Articles 3 and 4 of the Protocol on the privileges and immunities of the  European Union.  The contractor (or leader in the case of a joint tender) must complete the necessary  formalities with the relevant authorities to ensure that the supplies and services required  for  performance of the contract  are exempt from taxes and duties, including VAT.  If provided for in the special conditions, the contractor (or leader in the case of a joint  tender) submits invoices in electronic format if the conditions regarding electronic  signature specified by Directive 2006/112/EC on VAT are fulfilled, i.e. using a qualified  electronic signature or through electronic data interchange. II.18.2. E-invoicing  Reception of invoices by standard format (pdf) or email is not accepted. II.19. PRICE REVISION  If a price revision index is provided in Article I.4.2, this Article applies to it. Prices are fixed and not subject to revision during the first year of the contract.  At the beginning of the second and every following year of the contract, each price may be  revised upwards or downwards at the request of one of the parties.  A party may request a price revision in writing no later than three months before the  anniversary date of entry into force of the contract. The other party must acknowledge the  request within 14 days of receipt. At the anniversary date, the contracting authority must communicate the final index for  the month in which the request was received, or failing that, the last provisional index  27 