Common use of AUTHORITY TO MODIFY Clause in Contracts

AUTHORITY TO MODIFY. No modification or change in this Contract, no waiver of any of its provisions or any additional contractual relationship of any kind with the Contractor shall be valid and enforceable against UNESCO unless provided by an amendment to this Contract signed by the authorized official of XXXXXX.

AUTHORITY TO MODIFY. No modification or change in this Contract, no waiver of any of its provisions or any additional contractual relationship of any kind with the Contractor shall be valid and enforceable against UNESCO unless provided by an amendment to this Contract signed by the authorized official of XXXXXXUNESCO.