you have special price agreements with long-term customers and their deliveries get preferential treatment. At the end of the fiscal year, you can honor the loyalty of these customers with rebate payments. In other cases, you have only one contact with a business partner. For example, you order merchandise from a different vendor once, because your preferred vendor cannot deliver.You create collective master records for one-time customers.Business partners who have a business transaction with you only once are called one-time customers and one-time vendors.