SAP Organizational Plan for SAP Business Workflow

Question

Hi,
This is question is specific to SAP Business Workflow within ECC, relating to SAP Organizational Management:
We have more than one instance of SAP, where one instance is used to run all of our business, except SAP HR (let's call this SAP Instance 1), and another instance that is only used for SAP HR (let's call this SAP Instance 2);
We want to implement SAP business workflow (e.g. approving requisitions through workflow in ECC);
Is it possible to use our SAP organizational plan that is already defined in our SAP HR instance of SAP (SAP Instance 2), instead of defining an SAP Organizational plan in SAP Instance 1 only to support SAP business workflow. 
Is it possible to define an interface from SAP Instance 1 to 2, to look up the requisition approver, pass it back to instance 1, and then send the workflow to the appropriate person.  Or is there another better approach?  e.g. Replicate organizational plan that exists in instance 2 in instance 1?  SAP tools for this?
From what I have briefly read online thus far, I understand that "The organizational plan is part of the PD component "Organization and Planning. The organizational plan is maintained on a client-dependent basis. An organizational plan which was created for personnel management purposes (or is to be created) can be used in SAP Business Workflow without any changes, provided the workflow functionality and the personnel management application run in the same client."  To me, this sounds like that the workflow functionality and organizational plan must exist in the same system and client.
Any thoughts, suggestions, or any advice to share?
Cheers,

Answer 1

Hi AD1981,
Standard solution would be using distributed Organisational Management. There is custom ALE for this (check tcode SALE: Application Link Enabling (ALE) -> Modelling and Implementing Business Processes -> Predefined ALE Business Processes -> Human Resources -> Master Data Distribution -> Set Up Distributed Organizational Management). Basically you would maintain organsation in HR system and distribute changes to other instance using ALE. Workflow would rely on the distributed org. structure.
Regards,
Saku