Business Content Source System Assignment???

Hi Gurus,
i am installing Business content and after going thru few posts in this Forums i have been hearing about Source system assignment in the Business content screen.
but when ever i installed i never really used this option and we have only one R/3 source system
Can anybody explain me its functionality please
thankyou
harish

When you activate Business Content, DataSources from source systems are assigned to InfoSources in SAP BW. If you do not select a source system, all source systems are automatically assigned. If you have several source systems this may take a lot of time because transfer rules have to be activated for each DataSource from each source system.
However an assignment of a DataSource to an InfoSource may not be necessary for all existing Source systems.
Assign only the source systems you need to load data from for the Business Content Objects that you are going to activate.
You can subsequently change the selection you made.
The assignment of source systems is only relevant for transfer rules, DataSources and InfoPackages. If there is more than one source system, only those objects assigned to the specified source system are collected for the transfer. Objects that have not been assigned to the specified source systems are ignored.

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