‘Order form’ : a form by which the contracting authority orders supplies and related maintenance under this  FWC;  ‘Performance of a specific contract’ : the performance of tasks and delivery of the purchased  supplies/services by the contractor to the contracting authority; ‘Personnel’ : persons employed directly or indirectly or contracted by the contractor to implement the FWC;  ‘Pre-existing material’ : any material, document, technology or know-how which exists prior to the contractor  using it for the production of a result in the implementation of the FWC;  ‘Pre-existing right’ : any industrial and intellectual property right on pre-existing material; it may consist in a  right of ownership, a licence right and/or right of use belonging to the contractor, the creator, the contracting  authority as well as to any other third party;   ‘Professional conflicting interest’ : a situation in which the contractor’s previous or ongoing professional  activities affect its capacity to implement the FWC or to perform a specific contract to an appropriate quality  standard;  ‘Related person’ : any person who has the power to represent the contractor or to take decisions on its  behalf; 'Result' : any intended outcome of the implementation of the FWC, whatever its form or nature, which is  delivered and finally or partially approved by the contracting authority. A result may be further defined in this  FWC as a deliverable. A result may, in addition to materials produced by the contractor or at its request, also  include pre-existing materials;  ‘Request for supplies/services : a document from the contracting authority requesting that the contractors  provide a specific offer for supplies/services whose terms are not entirely defined under the FWC;  ‘Specific contract’ : a contract implementing the FWC and specifying details of a service to be provided,  other than maintenance service;  ‘Substantial error’ : any infringement of a contract provision resulting from an act or omission, which causes  or might cause a loss to the Union’s budget;  ‘Supplier portal’ : the e-PRIOR portal, which allows the contractor to receive or exchange electronic  documents, such as quotations, orders, dispatch and receiving advices or invoices, through a graphical user  interface. When necessary, these documents can be signed electronically by the authorised persons. Its  main  features  can  be  found  in  the  supplier  portal  overview  document  available  on:  https://webgate.ec.europa.eu/fpfis/wikis/display/ePRIOR/The+e-Procurement+suite.  II.2. ROLES AND RESPONSIBILITIES IN THE EVENT OF A JOINT TENDER  II.3. SEVERABILITY  In the event of a joint tender submitted by a group of economic operators and where the group does not have  legal personality or legal capacity, one member of the group is appointed as leader of the group. Each provision of this FWC is severable and distinct from the others. If a provision is or becomes illegal,  invalid or unenforceable to any extent, it must be severed from the remainder of the FWC. This does not  affect the legality, validity or enforceability of any other provisions of the FWC, which continue in full force  and effect. The illegal, invalid or unenforceable provision must be replaced by a legal, valid and enforceable  substitute provision which corresponds as closely as possible with the actual intent of the parties under the  illegal, invalid or unenforceable provision. The replacement of such a provision must be made in accordance  with Article II.11. The FWC must be interpreted as if it had contained the substitute provision as from its entry  into force.  13 