Europol Public Information  4. The  Contractor shall undertake to comply with the services level requirements as set out in the  Contractor’s  SLA. Compliance of these requirements shall be monitored by Europol. In the event of  non-compliance with one or more of the requirements, the Contractor shall submit an improvement plan in accordance with the provision of the SLA. Failure to submit and/or to  implement the  improvement plan  shall entitle Europol to apply the penalties/incentives scheme  described in the SLA. The penalties shall be credited to Europol against future  Purchase  Order/Specific Contract . If no invoice is due or foreseen within the next four (4) months period, or if  the total of service credits to be paid is higher than the  Contractor’s invoice, the financial  consequences of the  SLA  shall be invoiced by Europol. The  Contractor  shall issue in due time the  credit notes required to materialise any of the above. 5. The financial penalties/incentive scheme foreseen in the SLA will prevail over the liquidated  damages in Article II-23. For matters not covered by the SLA or in the absence of incentive scheme  in the SLA the provisions of Article II-23 remain applicable.  Article I-13  Trade-back  Article I-14  Storage and transport of Goods  1. In case of (temporary) storage of Goods in any (including sub-contractors) locations and/or in  warehouse/storage facilities, the  Contractor shall authorise Europol to inspect the Goods at its  locations. 2. Upon Europol’s inspection of the Goods, the  Contractor  shall be entitled to release a ‘Warehouse  Receipt’ listing all the Goods inspected by Europol.  3. Signature of the Warehouse Receipt shall under no circumstances constitute Europol’s final  acceptance of the Goods. Final acceptance shall be provided when the Goods are delivered and  installed at end destination. However by signing the Warehouse Receipt:  a. Europol acknowledges that the requested quantities of the Goods have been received and that  the received Goods comply with the specifications in terms of quantities and physical features  set out in the relevant  Specific Contract/Purchase Order ; Page 18 of 79  Europol’s initials:  Contractor’s initials:  2. In order to comply with security obligations, Europol will retain and destroy all mass storage  devices present in the trade back devices/Goods.  1. Should the Goods under the  Framework Contract be decommissioned by Europol or become  redundant due to evolution of the technical implementation, Europol may request a trade-back  on the Goods. Upon Europol’s agreement, the  Contractor  shall then warrant to use reasonable  endeavours to make use of the trade-back programme of the vendors in order to replace old  Goods with new Goods and obtain extra discounts. Trade-back shall be carried out at no cost to  Europol. 