Activities such as purchase order, production, and delivery are combined, to make this example clearer. As you can see from the relationships in the network, these activities do not take place simultaneously for all the components in the elevator.

Cabin door E-1317 is procured externally. When the activity is released, the system automatically creates a purchase requisition, which you then convert into a purchase order.

When the goods receipt is executed, the system posts the single stock material to the project stock.

The 50kW motor E-1500 and cabin E-1300 are produced in plant 1300 and managed as project stock:

When the activity is released, a reservation is created to cover the requirement; the WBS element for the activity is the planning element that caused the requirement.

The MRP run converts the reservations into planned orders. The secondary requirements for E-1500 and E-1300 are covered using a reservation on the components kept in stock.

When final confirmation is entered for the productions orders, materials E-1500 and E-1300 are posted to project stock.

In this process, delivery is from the Project System. The components to be delivered for the network are selected and entered in a delivery document. Further delivery processing takes place in Sales and Distribution.

Procurement activities are confirmed using the time sheet. Employees responsible for procurement enter the work they have done in timesheets. In the next step, the times they enter are transferred to the Project System and Human Resources.