English to French Bus/Financial Law (general) risque de crédit - garanties/collectivités locales

Bonjour

J'aimerais avoir votre avis sur la traduction "ability to raise defences to its liability" (cf ma tentative ci-après)
The rating of A’s EUR xxM guaranteed by B reflects the characteristic of the guarantee and the credit quality of the guarantor.
The guarantee is irrevocable and in the event of an overdue payment, B would be obliged to substitute A and to pay or perform on a full basis, waiving any right to object or **the ability to raise defences to its liability***.
la possibilité d’opposer des exceptions à sa responsabilité.



merci!