clear the confusion between DATA SOURCE and SOURCE SYSTEM

Question: Hi all gurus,

i am just starting BW . i am confusing the diffrence between DATA SOurce and SORCE SYSTEM.

Source System: is developed with in a BW system,so BW knows how to extract data from external system or database.

DATA SOURCE: is assigned to INFO CUBE, where to find the data and what are extract rules??

why we assign a data source to a INFO SOURCE .??
what is the basic function of "DATA SOURCE" in all this cycle.??
without "DATA SOURCE " object what happend???

please clarify me in detail (any fig). if possible good give me some stuff related to BW.

Thanks in advance
as "source system " contain the info, where to find the external data and protocol.
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Nawab Ahmed siddiqui
Sun Certified Java Programer.

Answer:
Well, well, well,
mister the Sun Certified Java Programer,
I think you should activate the very first method of the object called sapfans bw forums;
you can find this method in the class "basic rules";
this class is defined at the very beginning of the forum, it's type is "sticky".

Ch
sapfans bw certified helper

Answer:
This is a 3-day class

Can the BW certified helper please lock this @#$%! topic
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