IS-U one or two instance

Hello
The electricity industry body requires the access between supplier (retail) side of the business kept separate from the network (metering) side of the business. The current debate is to either implement one instance of IS-U or to have 2 instances of IS-U to meet this requirement. Has anyone had any experience in implementing one instance of IS-U to manage both the supplier and network side of the business?
Could you please share with me the pros and cons of having 1 instance vs. 2 instances of IS-U?
Thank you

Hi,
We have 2 client landscape. Gas distribution <> Gas retail, connected with ISU/IDE .
Distribution>
Device Managent> meter reading, installations
Work management> services etc.
Master Data > only technical (premises...)
Business>
Master Data
Billing and Invocing
FI-CA
CS,
+CRM 5.0
+BW connection
We have already made an ECC 6.0 Upgrade 12/2007
EDM si missing
IDE is the main inteface , between these two clients.
Pro`s Unbundled solution, different customization, development.
Zoltan

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Bruce Blackshaw <[email protected]> wrote in message
news:[email protected]..
"m holur" <[email protected]> wrote in message
news:<3c0d2b66$[email protected]>...
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