A vehicle sales agreement is a lawful arrangement summarizing the terms and conditions of a vehicle sale between a customer and a seller. This is a tutorial on the California residential purchase agreement.Upon the City's request, Cloverleaf agrees to provide to the City, within sixty. A master purchase agreement is a legally binding contract between buyer and seller, and typically relates to buying and selling goods rather than services. Is there anything I can do after I sign an auto purchase agreement then notice they added and made changes after I signed it? The Sales Contracting Officer (SCO) cannot award the contract until you have been cleared. Bill of sale: A written agreement confirming the sale, including purchase price and vehicle description. At any time after the. Anything added afterwards is not in the Purchase contract.