A one time showing agreement can give an agent permission to enter the sale, it does not conform to contracts we accept for entry. A One Time Showing Agreement is a commission agreement signed between a buyer's agent and a seller for specific named buyers.On homecoin, you select the agent that completes your listing and you complete all the correct forms and listing agreement on our website. In any resulting transaction in which Seller's property is not listed with Broker's firm, Broker will be the exclusive agent of Buyer and not a dual agent also. Sell your home for a Flat Fee and save thousands! The best Flat Fee MLS San Diego listing services are:1. 1. Defined Terms. a. The buyer must complete Form 593-I, "Real. Estate Withholding Installment Sale Agreement. Does this mean that brokerages can only have one agreement with the buyer?