Contract number: [ complete ]  Contract conditions of December 2015  cannot be processed. The reasons the contracting authority may cite for not being able to  process an invoice are:  (a) because it does not comply with the contract; (b) because the contractor has not produced the appropriate supplies or documents or (c) because the contracting authority has observations on the supplies or documents  submitted with the invoice. The contracting authority must  notify  the contractor (or leader in the case of a joint tender)  as soon as possible of any such suspension, giving the reasons for it.  Suspension takes effect on the date the contracting authority sends the  notification . The  remaining payment period resumes from the date on which the requested information or  revised documents are received or the necessary further verification, including on-the-spot  checks, is carried out. Where the suspension period exceeds two months, the contractor (or  leader in the case of a joint tender) may request the contracting authority to justify the  continued suspension. Where the payment periods have been suspended following rejection of a document  referred to in the first paragraph of this Article and the new document produced is also  rejected, the contracting authority reserves the right to terminate the contract in  accordance with Article II.17.1(c) .  II.20.8. Interest on late payment  On expiry of the payment periods specified in Article I.6, , the contractor (or leader in the  case of a joint tender) is entitled to interest on late payment at the rate applied by the  European Central Bank for its main refinancing operations in euros (the reference rate),  plus eight points. The reference rate is the rate in force, as published in the C series of the  Official Journal of the European Union  on the first day of the month in which the  payment period ends. Suspension of the payment period as provided for in Article II.20.7 is not considered as a  giving rise to late payment.  Interest on late payment covers the period running from the day following the due date for  payment up to and including the date of actual payment as defined in Article II.20.1.  However, when the calculated interest is EUR 200 or less, it must be paid to the contractor  (or leader in the case of a joint tender) only if requests it within two months of receiving  late payment. II.21. RECOVERY  II.21.2. Recovery procedure  II.21.1.  If an amount is to be recovered under the terms of the contract, the contractor  must repay the contracting authority the amount in question.  Before recovery, the contracting authority must  formally notify the contractor of its  intention to recover the amount it claims, specifying the amount due and the reasons for  recovery and inviting the contractor to make any observations within 30 days of receipt.  30 