SCM,
Think about it for a moment. How much sense would it make to create financial postings for valueless stock against stock accounts?
Anyhow, this thread is beginning to wander from Production Planning topics. If you are still curious about cost-related topics, check out help.sap.com
Product Cost by Sales Order - Cost Object Controlling (CO-PC-OBJ) - SAP Library
Best Regards,
DB49