Allocating Materials to a Network Manually 
The Assignments to Activity screen appears.
Depending on the settings in the material master and the assignments of the network or activity, a dialog box may appear in which you enter:
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If the material is managed in different stocks, the stock type (see Managing Stocks of Material Components)-
If the prerequisites to do so are met, you can generate preliminary requirements (see Advance Procurement)-
If the component are directly procured (item category N), you can create a third-party order. In this case the material is delivered directly from the vendor to the customer.On the General Data screen you can view the reservation number as well as the reserved quantity (required quantity). If you align the requirements to the start or finish date of the activity, you can enter an offset (see
For material with item category L you can see the number of the reservation in the General data detail screen.
For material with category N you can see information about whether a purchase requisition has been created in the Purchasing data detail screen, if requirements have been activated. You can go to the purchase requisition by choosing Purch. Req. . You can plan dates and values for payments by choosing Invoicing plan.