CB,
I'm assuming you are logged in to the sample app as John Smith (staff member).
To trace it down in the BSV:
1- look in Visual Perspectives / StaffMember
2- Menu section -- find 'New order' in the tree
3- 'New order' menu runs process CreateOrderForCustomer
4- CreateOrderForCustomer runs process CreateOrder
5- CreateOrder takes Customer BO as process input
6- CreateOrder creates PurchaseOrder BO & links it to Customer BO
7- View PurchaseOrder uses StaffEditing form of the PurchaseOrder BO because it is marked for 'Editing' for users of Access Level StaffMember.
Hope this helps.
Tom