Merging 2 BW systems into 1

Hi
We have recently started implementing BW 3.5 running on HP TRU64 o/s and are unable to upgrade to higher version without changing our hardware as any further development on TRU64 ceased in Dec 2005. BW reports are delivered through windows based EP6.0.
Right now we are about to commence implementation of a portals based HR solution on ERP2005 and EP7.0 and reporting will be BW based using BW7.0 (NW2004s) which is required to deliver the solution we require. All of this will be running on a separate environment (except EP which we will upgrade from 6.0 to 7.0).
Regarding BW, SAP have suggested that we run BW7.0 for HR as a separate instance on the HR server. This sounds appealing to us as we can buy a medium size server now for HR and BW with the view of unbundling BW-HR and including it back on our central BW system once we upgrade the hardware and BW version. This will give us additional capacity on the HR side due to the expected growth in the organisation in the next 3-5 years.
Is it possible to unbunble the BW-HR system and incorporate it back into our other BW system in the future once we have upgraded it to the same version? What challenges / problems are we going to face?
Thanks
Geoff

Hello:
The question you are asking is in the area of Enterprise Data Warehousing architectural strategy and planning. 
The keys in developing your strategy will be things like an empowered EDW architect, clear standards for objects, naming convention, the layers that are modelled, etc.
Perhaps the best answer to your question is to advise you to focus more heavily and in-depth in regards to your EDW strategy.  My concern is that you run the risk of developing "stovepipe" systems with a "data mart" strategy without centralizing and controlling optimially.
Of course you can run seperate SAP NetWeaver BI systems (BW is an outdated term), but the risk of massive missed value could be high if the strategy is not well-defined.
Please see the how to paper "How to...Enterprise Data Warehousing with SAP BI".
Best Regards -
Ron Silberstein, SAP NetWeaver Regional Implementation Group

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