Listing is nothing but whatever material u assign to particular customer, then he can access those materials. But exclusion is nothing but excluding the Particular material to the customer, then customer cannot access those materials. For example-In pharmaceutical company, customer sometimes the customer may not have a license to sell certain product, then we can use this function. 2.Listing is suppose for a certain or group of customers u can assign materials only those can access. Exclusion is suppose u don’t want that certain materials certain customer should not access .So the particular customer can not purchase the same . Always exclusion is having higher priority than listing. In exclusion the system refuses the entered materials if it is maintained in exclusion record for specific customer but in case of material listing it accepts only allowed material which we maintained in listing record for specific customer .