S.L. 601.9 Art. 89Consent of the concessionaire to execute the modification.

(1) Once a contracting authority or a contracting entity approves a modification, the concessionaire must lay down in writing whether he accepts to execute the same modification at the financial rates or sums and within the timeframe as specified by the contracting authority or the contracting entity.

(2) If the concessionaire carries out the modification without providing a written confirmation, it shall be deemed that he agreed to perform the modification at the conditions stipulated by the contracting authority or the contracting entity.