Use Case for a simple Order Entry system

· An Order Entry window sends a “prepare” message to an Order

· The Order sends “prepare” to each Order Line on the Order

· Each Order Line checks the given Stock Item:

· if check returns true (there’s enough in stock):

1) remove apprpriate quantity of Stock Item from stock

2) create a deliver item

· else if Stock Item falls below reorder level

then Stock Item requests reorder