Inter-Project scenario in a Project Manufacturing context.

Though most of the following functionality is non-Projects, I was wondering if anybody has done Inter-Project scenario encompassing following:

Scenario: Central invoicing organization received customer orders, runs MRP Plan and releases 'procurement' orders to various locations (within US as well as offshore) for individual lines on the customer Sales Order (each line tied to a specific Project/Task)

We're looking for previously implemented solution(s) where Sales Orders and Purchase Orders were used in place of the standard Oracle Internal Requisition/Internal Sales Order (IR/ISO) processes.  Our interest is specific to any of the following:

• Technology used (e.g. EDI, Point to Point, etc) to deliver and receive SO and PO information between OU's.