1) If, at line 5) of the Basic Flow, the sales assistant chooses to backorder the selected product, then:
2) The system displays the backorder screen to the sales assistant
3) The system displays the available warehouses to the sales assistant
4) The sales assistant selects a warehouse on the system
5) The system displays the available stock for the product at that warehouse to the sales assistant
6) The sales assistant enters the required quantity for the backorder into the system
7) The system displays the required quantity to the sales assistant
8) The sales assistant selects delivery or collection on the system
9) The system displays the backorder information as an order line on the order screen to the sales assistant
10) The use case restarts at line 10) in the basic flow
