Subcontracting with Production Version 
Use
If an assembly is produced by different subcontractors or produced in-house with different BOMs, the system is to take this into account during the BOM explosion in the planning run.
Prerequisites
Integration
You can find the transactions for maintaining info records and the source list in the Purchasing menu, under Master data.
Features

The production version from the subcontractor purchasing record has a higher priority than the production version from the quota arrangement.