Hello John,
Since one of the company code in legacy & you ( Existing company code in SAP) bought RM from legacy system. The following process must be design for standalone and consolidation purpose.
1. Create PO ( Vendor is Intercompany CC)
2. Goods received throuhg MIGO ( Maintain separate GL accounts for RM for consolidation purpose.
3. Post Invoice ( Maintain separate accounts payable GL account for consolidation purpose.
So that you can easily eliminate those entries while doing the consolidation.
If not possible to create separate valuation class > Atleast maintain separate PO document type to identify those entries to eliminate the while consolidation.
Regards
Mani Kumar