 2019  Contract number: [ complete ]  I.5.2 Price revision index  I.5.3 Reimbursement of expenses  I.6. PAYMENT ARRANGEMENTS  I.6.1 Pre-financing  I.6.2 Interim payments  I.6.3 Payment of the balance   Price revision is determined by the formula set out in Article II.20 and using the trend in the  ‘European index of consumer prices’ (EICP) of the harmonised indices of consumer prices (HICP) published for the first time in Eurostat’s monthly ‘Data in Focus’ publication available on the  website: http://www.ec.europa.eu/eurostat/. Reimbursement of expenses is not applicable to this FWC.  Pre-financing is not applicable to this FWC.  1. The contractor (or leader in the case of a joint tender) may claim an interim payment up to  75% as stipulated in the relevant specific contract in accordance with Article II.21.6. The contractor (or leader in the case of a joint tender) must send an invoice in paper format or  via  e-PRIOR  for the interim payment as provided for in the tender specifications, accompanied  by the following:  2. The contracting authority must approve any submitted documents or deliverables and pay  within 60 days from receipt of the invoice. 3. If the contracting authority has observations to make, it must send them to the contractor (or  leader in the case of a joint tender) and suspend the time limit for payment in accordance with  Article II.21.7. The contractor (or leader in case of a joint tender) has 10 days to submit  additional information or corrections or a new version of the documents if the contracting  authority requires it.  4. The contracting authority must give its approval and pay within the remainder of the time- limit indicated in point (2.) unless it rejects partially or fully the submitted documents or  deliverables.  1. The contractor (or leader in the case of a joint tender) may claim the payment of the balance  in accordance with Article II.21.6. • for the deliverables covered by the interim payment, a list of all  pre-existing rights  to the  results  or parts of the  results  or a declaration stating that there are no such  ,  as provided for in Article II.13.4; • the deliverables and other documents specified in the specific contract or order form;  7 