Payment by Parent OU inrespect of AP Invoices of Child OU's in 11i Environment

 Hi!How could in 11i Environment One operating Unit (say,Head Office Branch, which is Parent of all Operating Units) make Payments In respect of AP Invoices of all other operating units (child/Subsidiaries).

NOTE : All Operating Units have same SOB,Calendar and Currency.

One option is AGIS.

Other than above Is there any other Procedure/Practice/Option?

Required  guidence/advice in this regard.