Contract number: ECHA/2020/666  If the contractor repeatedly refuses to sign the specific contracts or repeatedly fails to send  them back on time, the contractor may be considered in breach of its obligations under  this FWC as set out in Article II.18.1 (c).  The maximum amount covering all purchases under this FWC, including all renewals and  reimbursement of expenses is EUR [ amount in figures and in words ]. However, this does  not bind the contracting authority to purchase for the maximum amount.  The maximum prices of the services are as listed in Annex II.  I.5. PRICES  I.5.1. Maximum amount of the FWC and maximum prices  I.5.2. Price revision index  I.5.3. Travel expenses  Price revision is determined by the formula set out in Article II.20 and using the trend in  the harmonised indices of consumer prices (HICP) MUICP [Monetary union index of  consumer prices’] published for the first time in Eurostat’s monthly ‘Data in Focus’  publication available on the website: http://www.ec.europa.eu/eurostat/. The contracting authority will compensate for travel and subsistence expenses directly  connected with the provision of the services under a specific contract in case of work  performed at a third-party location, different from the contracting authority’s or the  Contractor’s premises. The payment will be based on a lump sum covering all travel,  subsistence and accommodation costs, which shall be calculated in accordance with Article  II.22. The daily subsistence allowance referred to in Article II.22.4 (d) and the  accommodation flat-rate ceiling referred to in Article II.22.4(e) are listed in Annex IV. In the context of the optimisation of services as provided for in Annex I (Section 4.7 of  Technical Specifications), and to accommodate innovation with respect to services or  technologies not available on the market or not initially foreseen at the time of  establishment of the FWC, provided that those services or technologies are technically  similar to the ones covered in Annex I, the parties shall mutually agree the prices for such  services. The prices for the new services shall to the greatest extent possible be based on  the prices for the same or similar services as laid down in the price catalogue included in  Annex II.  These new services will be ordered on the basis of a quote provided by the contractor,  which shall require prior approval by the contracting authority which may undertake peer  review by the contractor in [FWC666 LOT 1][FWC666 LOT 2]. I.5.4. Innovation I.6. PAYMENT ARRANGEMENTS  I.6.1. Pre-financing  I.6.2. Interim payment  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  in accordance with the relevant specific contract and in accordance with Article II.21.6. 8 