In manufacturing subcontracting, a company hires an external supplier to perform a manufacturing or processing activity while the company may provide some or all components. The business needs to track those components at the supplier, the agreed processing charge, finished output received and actual component consumption. In a standard SAP S/4HANA subcontracting procurement scenario, a subcontracting purchase order can identify the finished material and the components to be provided.
Why manufacturers subcontract
A factory may outsource coating, machining, assembly or packaging because a supplier has specialized equipment, capacity or expertise. The commercial decision does not remove the manufacturer's responsibility for material planning, quality, traceability or delivery commitments. Even when parts leave the physical factory, their ownership and stock treatment may differ from an ordinary sale.
Follow the materials and the paperwork
The purchasing team places a subcontracting order, typically using item category L in the relevant SAP purchasing process, for the required output. The bill of materials or a manually maintained component list identifies supplied parts. Warehouse or logistics teams arrange to provide components; in the standard process these can be tracked as stock provided to the supplier.
The supplier performs the agreed activity and returns the finished material. At goods receipt, the subcontracted output is received and the system can post consumption of the provided components. Actual consumption may differ from plan, so the business needs a documented method for adjusting excess use or unused material. The supplier's invoice and the costs of supplied materials contribute to the overall economic picture.
Example: outsourced bracket coating
An automotive components manufacturer sends 1,000 uncoated brackets to a specialist coating supplier. The contract calls for 980 acceptable coated brackets and recognizes expected processing loss. Planning must align component dispatch, coating capacity and the factory's next assembly requirement. On return, receiving checks accepted quantity, quality and remaining component stock against the supplier's declaration.
If fewer acceptable brackets arrive, the team must distinguish process scrap from missing material and decide how to post differences. A shipment to a subcontractor is not necessarily a sale to that subcontractor, and a supplier delivery is not proof that all components were consumed as planned.
Controls and consultant questions
Ask who owns provided components, how supplier stock is reconciled, whether planned usage from the BOM is realistic, how quality rejects are handled and how processing charges are approved. Test partial deliveries, over- and underconsumption, late returns and direct-to-subcontractor component deliveries when relevant.
Subcontracting in purchasing differs from outsourcing a single production operation and from buying a finished product outright. Specific app names, movement flows and financial postings depend on deployment scope and configuration; confirm the organization's chosen process before prescribing a transaction sequence.
Related Knowledge
Connect this to manufacturing procurement, supplier scheduling and engineering changes. Return to Industries.