II.5.4. Validity and date of e-documents  II.5.5. Authorised persons in  e-PRIOR II.6. LIABILITY  20  II.6.3  The contractor is liable for any loss or damage caused to the contracting authority during or as  a consequence of  Implementation of the FWC , including in the event of subcontracting, but  only up to an amount not exceeding three times the total amount of the relevant specific  contract. However, if the damage or loss is caused by the gross negligence or wilful misconduct  of the contractor or of its  Personnel or subcontractors, as well as in the case of an action  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.  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 . 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. 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 . 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. 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 . (d) constitutes evidence of the information contained in it and is admissible as evidence in  judicial proceedings. (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  (b) is deemed to be the original of the document;  (a) is considered as equivalent to a paper document; 1. The parties agree that any e-document, including related attachments exchanged via  e-PRIOR :  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 Communication 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.