The Guarantee shall remain in full force and effect notwithstanding any amendment to the terms of the Agreement, or any waiver or forbearance By the Factor in the exercise of any of their rights under the Agreement, or under this Guarantee. In accordance with Article 243 of Royal Decree 55/90 , the Factor reserves its rights to enforce this Guarantee against the Guarantor notwithstanding any renewal, extension, increase, reduction or alteration of any kind of the payments due from notice to the Guarantor in respect of any such renewal, extension, increase, reduction or alteration.