Contract number: [ complete ]   2019  (a) is considered as equivalent to a paper document; (b) is deemed to be the original of the document;  (c) is legally binding on the parties once an  e-PRIOR authorised person has  performed the ‘sign’ action in  e-PRIOR  and has full legal effect; and  (d) constitutes evidence of the information contained in it and is admissible as  evidence in judicial proceedings. 2. The parties expressly waive any rights to contest the validity of such a document solely  on the grounds that communications between the parties occurred through  e-PRIOR  or  that the document has been signed through  e-PRIOR . If a direct connection is  established between the parties’  back offices  to allow electronic transfer of documents,  the parties agree that an e-document, sent as mentioned in the  interface control  document , qualifies as an  EDI message . 3. If the e-document is dispatched through the  supplier portal , it is deemed to have been  legally issued or sent when the contractor (or leader in the case of a joint tender) is able  to successfully submit the e-document without any error messages. The generated PDF  and XML document for the e-document are considered as a proof of receipt by the  contracting authority. 4. In the event that an e-document is dispatched using a direct connection established  between the parties’  back offices , the e-document is deemed to have been legally issued  or sent when its status is ‘received’ as defined in the  interface control document . 5. When using the  supplier portal , the contractor (or leader in the case of a joint tender)  can download the PDF or XML message for each e-document for one year after  submission. After this period, copies of the e-documents are no longer available for  automatic download from the  supplier portal . II.5.5 Authorised persons in e-PRIOR  II.6. LIABILITY  The contractor submits a request for each person who needs to be assigned the role of ‘user’ in  e-PRIOR . These persons are identified by means of the European Commission Authentication  Service (ECAS) and authorised to access and perform actions in  e-PRIOR within the  permissions of the user roles that the contracting authority has assigned to them.  User roles enabling these  e-PRIOR  authorised persons to sign legally binding documents such  as specific tenders or specific contracts are granted only upon submission of supporting  documents proving that the authorised person is empowered to act as a legal representative of  the contractor. II.6.1 The contracting authority is not liable for any damage or loss caused by the contractor,  including any damage or loss to third parties during or as a consequence of  implementation of the FWC . II.6.2 If required by the relevant applicable legislation, the contractor must take out an  insurance policy against risks and damage or loss relating to the  implementation of the  FWC . It must also take out supplementary insurance as reasonably required by standard  practice in the industry. Upon request, the contractor must provide evidence of insurance  coverage to the contracting authority.  18 