Mapping data flow from R/3 to BW

Hello,
I am pretty new to BW and I have been tasked with creating a detailed map of the data flow from R/3 into BW. 
I need to record where the data originates from in R/3 (field names/tables) and literally track the flow of that data all the way including any info objects along the way to any cubes that it may be sitting in.
How do I track this flow ? And how can I identify what a characteristic in BW is in R/3 ?
Has anybody had to create a similar data flow ? If so how did you approach this ?
Many Thanks,
Matt

Hi Matthew,
From the R/3 side:
BW treats all the data from R/3 as Datasources.
From the Datasource the upload of data to the cube is done as..        
<b>Datasource->Transfer Rule->psa/infosource->communication structure->cube</b>
(for a 3.5 system)
in case of 7.0 system... data flow is as follows...
<b>Datasource->infopackage->psa->transformation/DTP-> Data target(cube)</b>
-> Go to transaction <b>RSA5</b>( for Business Content datasources ) and <b>RSA6</b>( for all the active Datasources ) found in the system.
-> There you can find all the data that you want...(For your mapping purpose this will do..)
-> You can as well check from the BI side in the transaction RSA1 -> click on the Monitor button on the left ( for custom objects ) or Business Content button -> choose the object from the tree... right click and replicate to find if all of them were used.
Hope this helps!!
<b>*</b><i>Reward Pts if useful</i><b>*</b>
regards,
Naveenan.

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