The Declaration(s) on Honour on exclusion and selection criteria (template available in the tender  specifications) shall be dated and signed, either by hand or by applying a qualified electronic signature,  by an authorised representative of the signatory.  When the Declaration(s) on Honour is/are signed by hand, a scanned copy must be attached to the  tender in eSubmission. The hand-signed original(s) must be sent by letter to the contracting authority's  postal address specified under Heading I.1 of the contract notice at the latest on the first working day  following the electronic submission of tender. The envelope, clearly mentioning the reference to the call  for tenders and the eSubmission ID of the tender must be marked as "CALL FOR TENDERS – NOT TO  BE OPENED BY THE INTERNAL MAIL DEPARTMENT". Only the original(s) of the Declaration on  Honour are to be sent by letter, not other documents.  After submitting a tender, but before the deadline for receipt of tenders, a tenderer may definitively  withdraw its tender, or withdraw it and replace it with a new one 5 . A withdrawal receipt will be provided  by eSubmission as proof of withdrawal. All costs incurred for the preparation and submission of tenders are to be borne by the tenderers and  will not be reimbursed. This invitation to tender is in no way binding on the contracting authority. The contracting authority’s  contractual obligation commences only when the contract with the successful tenderer is signed by both  parties.  Up to the signature of the contract, the contracting authority may cancel the procurement procedure  without tenderers being entitled to claim any compensation. Any such decision must be substantiated  and tenderers notified.  The validity period of the tender, during which tenderers may not modify the terms of their tenders in  any respect, is indicated under Heading IV.2.6 of the contract notice.  Submission of a tender implies acceptance of all the terms and conditions set out in the procurement  documents and, where appropriate, waiver of the tenderer's own general or specific terms and  conditions. The submitted tender is binding on the tenderer to whom the contract is awarded for the  duration of the contract.  Contacts between the contracting authority and tenderers are prohibited throughout the procedure save  in exceptional circumstances and under the following conditions only:  Upon request, the contracting authority may provide additional information solely for the purpose of  clarifying the procurement documents.  5 To submit a new version, the tenderer must create a new tender in e-Submission and include all the information  and documents required in the procurement documents with the submission of a tender, even if some of them  have already been included in the replaced tender.  Santiago de Compostela 12, 5th floor - 48003 Bilbao GLYPH<31> Spain  Tel. +34 944 358 400 GLYPH<31> Fax +34 944 358 401  information@osha.europa.eu    http://osha.europa.eu 2 2  Legal effects of the invitation to tender and submission of a tender  3  Contacts during the procurement procedure  3.1  Submission phase (before the time-limit for receipt of tenders)  Version March 2019 