Ohio requires all architects to enter into written contracts with their clients unless the services prior to beginning work on the project. A registered architect or architectural firm is required to use a written contract when providing professional services.Steps to Create the Contract. Role of the Contract. The assignment agreements come in a variety of forms. The lending institution generates the documents. A how to for completing the AIG vendor registration process and associated electronic form, and instructions form to register as a Lobbyist. List of all current AIA Contract Documents. The plaintiff established the first element of a breach of contract claim. However, Martin argues that there are two contracts here: one between Martin and Aaon.