Intercompany Relationships

Looking for a suggestion on creating a relationship between two companies in Lawson where an intercompany entry in the GL40 is not require. The scenario would play out like this: Company nbr 1 orders product from company nbr 2. Co nbr 1 bills co nbr 2. There is no payment out the door, instead the dollars would pass from one co to another in the GL. Everytime I walk through the scenario, everything works until co nbr 2 tries to pay nbr 1.