New source system and 0logsys

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hello,

We already have a BW production system connected to a unique SAP R/3 system.

Our infoproviders (ODS and infocubes) and our infoobjets are not compounded with 0logsys or 0sourcesystem.

We have to connect a second R/3 system to our BW systems.

Our problem is that we will be able to find master data with the same range in each system (for instance costcenter XXX will exist in both system but with different attributes).

My question is :

do I have other solution than adding 0logsys (or 0sourcesystem ?)as a compound of each master data we use and in all providers ?

Can you confirm me that for adding this compound "everywhere" i will have to empty all my infocubes/ods/master data ?

I've never done such transformation in BW so If you have advice to give it will be nice.

Hope my question is clear...

Thanks a lot