Contract number: ECHA/2020/666  ‘Interface control document’ : the guideline document which lays down the technical  specifications, message standards, security standards, checks of syntax and semantics,  etc. to facilitate machine-to-machine connection. This document is updated on a regular  basis; ‘Irregularity’ : any infringement of a provision of Union law resulting from an act or  omission by an economic operator, which has, or would have, the effect of prejudicing the  Agency’s budget.  ‘Notification’  (or ‘notify’): form of communication between the parties made in writing  including by electronic means; ‘Order form’ : a simplified form of specific contract by which the contracting authority  orders services under this FWC;  ‘Performance of a specific contract’ : the execution of tasks and delivery of the  purchased 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  parties;  ‘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; ‘Request for services’ : a document from the contracting authority requesting that the  contractors in a multiple FWC provide a specific tender for services whose terms are not  entirely defined under the FWC; ‘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 ; ‘Specific contract’ : a contract implementing the FWC and specifying details of a service  to be provided;  ‘Substantial error’ : any infringement of a contract provision resulting from an act or  omission, which causes or might cause a loss to the Agency’s budget.  ‘Supplier portal’ : the  e-PRIOR  portal, which allows the contractor to exchange electronic  business documents, such as invoices, through a graphical user interface; its main features  can  be  found  in  the  supplier  portal  overview  document  available  on:  22 