The Agreement and any related Purchase Commitment constitute the entire understanding between the parties hereto with respect to the sale and purchase of each Mortgage Loan hereunder and thereunder and supersede all prior or contemporaneous oral or written communications regarding same. The Seller and the Purchaser understand and agree that no employee, agent or other representative of the Seller or the Purchaser has any authority to bind such party with regard to any statement, representation, warranty or other expression unless said statement, representation, warranty or other expression is specifically included within the express terms of the Agreement. The Agreement shall not be modified, amended or in any way altered except by an instrument in writing signed by both parties.