Subcontracting and operation outsourcing both involve external resources, but they should not be forced into the same process model. The difference is not only terminology. It affects material movement, production order control, cost collection, and quality responsibility.
In subcontracting, the focus is usually on components issued to a supplier and finished or semi-finished goods received back. In operation outsourcing, the production order remains the backbone, and an external party performs one or more operations. Mixing these two models too early often creates confusing stock, unclear WIP, and difficult cost analysis.
Design questions to settle first
- Does the supplier receive components, or does it only provide processing capacity?
- Should external work be managed through purchasing documents, production operations, or both?
- Where should scrap, rework, quality inspection, and cost variance be reflected?
A practical solution normally starts from the physical flow. Once material ownership and process responsibility are clear, the SAP document flow becomes much easier to choose.