English to Spanish Law/Patents Law: Contract(s)

Hola

estoy buscando una traducción distinta a "a condición de que" y similares que encaje en este contexto:

This Agreement may be amended, and any provision of this Agreement may be waived; ***provided that*** any such amendment or waiver shall be binding upon a Party only if set forth in a writing executed by such Party and referring specifically to the provision alleged to have been amended or waived. No course of dealing between or among the Parties (including the failure or delay by any Party in exercising any right, power or privilege

Me da la impresión de que es una frase hecha tipo "considerando que". ¿Alguien me puede ayudar?

Mil gracias de antemano