AR Intercompany invoicing

Sunil Shah

In JDE World 7.3 Cume 16 - trying to raise an intercompany invoice from group company one to a second group company where the account in the Invoice journal is pointing to a buisness unit in the second group company. When trying to post this invoice, i get an invalid company error message in the report.
Is what i trying to do possible?
Or is something required to be setup, e.g. in AAI's?