This field indicates either the code of the final customer or the customer code of the order giver. In both cases, the customer must be defined in the Customer object. (Menu "Database - BP - Customers). Selection of a customer code : The contextual menu "Selection" associated with the Customer field is : To select a customer from amongst all the customers defined in the business partner if the order giver field is empty. To select a customer from amongst all the customers of the order giver entered in a service request.