Europol Public Information  v. Europol shall pay within the remainder of the time indicated above, unless it rejects the  submitted documents partially or fully. Europol shall have the right to reject the invoice on the  basis of Article II-11 (“ Reduction in payment and off-setting ”).  7. Invoices for interim payment and/or payment of the balance shall be admissible only if compliant  with the following conditions:  (i) stating the reference number of the  Framework Contract  and the applicable  Specific Contract  or  Purchase Order , and – as applicable – the details of the goods delivered and/or services  performed. (ii) accompanied by the following supporting documents: - copy of the certificate of conformity (for goods delivered) or where applicable, the Delivery  Note and/or  Acceptance  (for services or  Deliverables ), as applicable,  - detailed justification of the price charged, including but not limited to print-out of  Timesheets, if applicable,  - list of  Pre-existing IPR  or statement that there are none, if applicable  - relevant progress report with reference to Tender Specifications if indicated in the relevant  Specific Contract  or  Purchase Order . Europol shall have 30 (thirty) days from the receipt of  the invoice to pay the balance. The  Contractor  shall have 20 (twenty) days in which to submit  additional information of a new final progress report if it is required by Europol.  - statement of reimbursable expenses in accordance with Article II-10 (“Reimbursements”),  Article I-10 (“Specific provision related to Reimbursement of expenses for travel and  allowances expenses”) and I-11 (“Specific provision related to reimbursement of expenses for  shipment of Goods”), if applicable.  - as applicable for (temporary) storage of the Goods, the signed Warehouse Receipt, - A  Purchase Order  or  Specific Contract may stipulate additional conditions and/or evidence  documents with regard to the payment, taking into account the specifics of the  Services  to be  performed or the characteristics of the Goods to be delivered by the  Contractor . Europol may  request the  Contractor to provide a delivery planning together with a request for interim  payment(s).  - Any deduction for pre-financing amount(s) as referred to in paragraph 2 above, where  applicable;  - Any reference to any uplifts applied by the  Contractor ;  8. If the number of working hours agreed to in a particular  Purchase Order  or  Specific Contract  has not  been fully taken up, Europol shall not be obliged either to use or to pay the hours not worked and  the  Contractor  shall not be entitled to claim payments and/or damages for them.  9. Specific provision for payment of licence fees and maintenance:  Page 12 of 79  Europol’s initials:  Contractor’s initials:  One-off licence fees shall be invoiced when the relevant Delivery Note, or, where applicable, the  Certificate of Conformity has been signed. Yearly licence fees and maintenance fees may be  invoiced per calendar year and paid in advance for the agreed period. The first invoice can cover the  period from the date of signature of the Delivery Note, or, where applicable, the Certificate of  Conformity of the software, or, as regards maintenance, from expiry of the guarantee, to the end of  the current calendar year. In exceptional cases and subject to prior written approval from Europol, 