If a material component is produced or assembled in a network activity and is consequently used, for instance for a delivery, then it is considered an assembly item.

Assembly items are created in network activities and are represented as reservations with negative quantities. When you assign an assembly item to a network activity, the receipt date for the assembly item is automatically set by the system to the activity finish date.

You can assign an assembly item to an activity either manually, by entering a negative requirements quantity, or by using BOM transfer.