No term of the Credit Documents and/or Security Documents may be amended, and the performance or observance by the parties to a Credit Document or a Security Document of any term of such Credit Document or Security Document may not be waived (either generally or in a particular instance and either retroactively or prospectively) without the written consent of the Requisite Lenders; provided, however, that except for amendments relating to the adjustment of the amount of principal, the rate of interest, the payment of premiums or the date of maturity, any permitted amendment or waiver under this Section 5.1 shall constitute an amendment or waiver applicable all Credit Documents and Security Documents (on a pro rata basis in accordance with the amount of the Obligations owed to each Lender, as appropriate), as the case may be.