Two main reasons why this is a must:I believe it should be possible for the external warehouse to plan and schedule its transports (load building) & prioritize stock needs. Our customer, wants to reserve its stock as close in time as possible to releasing the load to the warehouse. The main reason for this is that often, inventory adjustment journals are booked in the external warehouse (due to people that are 'shopping' in the warehouse because of urgent item needs) & later on these inventory updates are pushed towards the sales entity. When stock is already reserved in the WOM entity & sales entity, shopping will become impossible, thereby affecting business massively since the most urgent stock needs can only be fulfilled after dereservation of the stock (cumbersome task). In my opinion, reserving stock on the sales order is more dangereous than reserving it on the outbound shipment order since there exist a time delay between the transactions executed in the WOM and updates being pushed to the sales entity. Hence it could be that you reserve stock in the sales entity that is already being 'shopped' in the WOM.