Article R3135-7 of the French Public procurement code
The concession contract may be amended without a new competitive tendering procedure if the changes, whatever their amount, are not substantial. For the purposes of Article L. 3135-1, an amendment is deemed to be substantial when at least one of the following conditions is met: 1° It introduces conditions which, if they had been included in the initial award procedure, would have attracted more participants or allowed the admission of…