Translate the following English sentence to French:
"I can assure you of just one thing, Mrs Izquierdo Rojo, and that is that, as far as we are concerned, the financial perspectives, which were the product of tough negotiating in Berlin, represent a framework which it would be extremely difficult for us to shift."
La seule chose que je peux vous assurer, Madame, c'est que, pour nous, les perspectives financières, difficilement négociées à Berlin, constituent un cadre qu'il nous sera extrêmement difficile de bouger.