they may not be modified in any way whatsoever without the express agreement of both party. neither of the two party may suddenly stop performing the order. the party whose price proposal was refused after negotiations in good faith may terminate the order subject to the conditions set forth herein, but in the event of termination by the supplier, valeo must be able to ensure the continuation of the performance of its obligations to its customer until manufacture of the supply that is the subject of the terminated order begin once again at another supplier's facilities.