Deal Income and Billing at SUpplier, Partner, Broker and Manufacturer

We have a business scenario in one of our legacy system for which we are trying to create a high-level solution . Would appreciate any suggestions.

We had a requirement that billbacks (deals) are negotiated by customer with manufacturers (for e.g., Nestle) who fund the billback while suppliers deliver merchandise to stores. Customer raises deal income invoice against manufacturers. They are created as Customers in EBS AR and the deal income is also invoiced through EBS AR. There is an indirect relationship that currently exists in legacy between the manufacturer and the suppliers, bridged by item (i.e., item- supplier and item-manufacturer). In Legacy , the deal income is calculated based on receipts for all suppliers associated with the items in the billback and invoiced against the selected manufacturer.