translate English to French: The negotiated procedure without prior publication of a contract notice may be applied for new works or services consisting in the repetition of similar works or services entrusted to the economic operator to whom the same contracting authorities awarded an original contract, provided that such works or services are in conformity with a basic project for which the original contract was awarded according to the restricted procedure, the negotiated procedure with publication of a contract notice or the competitive dialogue.
Toutefois, le montant cumulé des marchés passés pour les travaux ou services complémentaires ne doit pas dépasser 50 % du montant du marché initial; 6.