Enter single receipt to multiple legal entities / operating units

Dear All,

My customer having a business requirement where customer is clubbing the payment (receipt) for two separate organizations and sending them as one check (single receipt). However they are entering separatesales invoices for each organization. That mean they do not clubbing invoices in multiple organization but they are accepting checks for both organization and issuing one receipt to the customer. How can i handle this scenario in oracle EBS R12. Is it possible for me to handle this through inter company functionality in oracle.

Organization set up :These two companies have have separate ledgers , legal entities under same business unit.