Sub Contracting Process in Inter Company Scenario

[PM9]

We have a scenario of having multiple company codes (subsidiaries) namely CC-A, CC-B, CC-C, CC-D and so on, under one Company XYZ. All the company codes manufacture same product by name "ALPHA".

Due to production capacity constraints, Company Code CC-A is sending Raw Materials to CC-B for sub-contracting and getting back the product ALPHA. In this scenario, the same product is also Manufactured by CC-B. In such scenario I do not have any questions on Company Code CC-A, as it raises a Purchase Order with Account Assignment Category "L" and send the materials with 541 moment type and receive the FG Materials with 101 Moment type and all the RMs will triggered to consumption based on the BOM components.

My question here is, how it has to be handled in Company Code CC-B as it also has the same Raw Materials and Finished Products in CC-B Inventory. How to differentiate the Materials that are belongs to CC-A because it is a Non-Valuated Inventory in Company Code CC-B, further after conversion, how the Finished Goods to be sent to Company Code CC-A? means with which business scenario. CC-B cannot sell the Finished Product to CC-A as the RMs and belongs to CC-A only. CC-B is entitled to get its Conversion (Job-work) charges only. How can they raise Invoice for Conversion Charges is it going to be posted through FB70 or Sales Order Process?.

Could some one throw some light on this please?.