The work order BOM is derived from the item’s product structure, defined in Product Structure Maintenance (13.5) or Formula Maintenance (15.5), and the quantity ordered. Inventory allocations and issues are based on the bill. MRP uses the bill of material to calculate component demand.

See Material Requirements Planning.

As work progresses, you can make any required changes to the work order BOM. This way, you can compare what you actually use with the standard. Item quantities allocated, issued, or picked are also maintained in the BOM.

Once the work order status is Exploded, Allocated, or Released, no more changes can be made to the BOM. However, you can reassign the picking location for items on the bill even if the work order status is Allocated or Released. Use Work Order Bill Maintenance (16.13.1) to make adjustments.