Project Costing - Charging Projects Across Operating Unit/Legal Entities

We are currently experiencing an issue with Project charges between Operating Units. Using the below example, is there some available configuration that will allow us to perform our business objective using the Project Costing module:

NOTE: The Project Orgs/Operating Units sit under different LEGAL ENTITIES

Example Configuration:

- Operating Unit A - has a single project Org named "PA Org B". There are a number of projects in "PA Org B"
- Operating Unit Z - has a single project Org named "PA Org Y". There are a number of projects in "PA Org Y"

Required Functionality:

- Using an Iproc/AP Invoice Entry/iExpense responsibility from "Operating Unit A", is there a way to configure the system to so that we can see both "PA Org B" and "PA Org Y" - Projects and Tasks. Current functionality seems to limit the available of only the Project Org that is linked to the Operating unit ("PA Org B"), and we would need to expand this to include the Project/Tasks setup in "PA Org Y"