2.2 This Master Agreement for Preferred Vendor-Design and Professional Services shall terminate on September 30, 2018. Professional Design Services for the State Hall Renovation - 2021.Prebid Registration Form. Learn what a vendor contract is, what should be included, and how digital contract management can help streamline your processes. In most practical cases, it's the main contractor who has the pre-prepared contract document before contracting the subcontractor. Entire Agreement (Parol evidence): The contract, as specified above, represents the final written expression of agreement.