In the Item Master File, the requirements code is used to specify the type of demand for the item. Planned order requirements are determined from the type of demand. If the requirements code is left blank, the planning systems treat the item as a sum code (3).
Other options for the field are:
1 = Dependent demand that is indirectly generated from the parent item requirements.
2 = Independent demand generated from customer orders and forecasts.
3 = The Sum of both independent and dependent demand.