Within 60 days of the date of termination, the contractor must submit any report, deliverable or  result and any invoice required for services 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), (g), (k) and (l) of Article II.18.1, under the  conditions set out in Article II.11.2.  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 7 of the Treaty on the Functioning of the European Union 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. Reception of invoices by standard format (pdf) or email is not accepted.  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 available for that month. The  contractor establishes the new price on this basis and communicates it as soon as possible to the  contracting authority for verification. The price revision is calculated using the following formula:  30  II.20 PRICE REVISION  II.19.2 E-invoicing  II.19.1 Invoices and value added tax  II.19 INVOICES, VALUE ADDED TAX AND E-INVOICING 