Data load from R/3 to BW in CSV format

Question: Hiya

Does anyone knows if there is a quicker way to extract data from sap R/3 and how to find the R/3 tables corresponding with the fields.
I'm currently thinking of selecting data from SE16 and load this in CSV file but this will be a lengthy process, however I might be able to have one of our programmers to write a query to make this easier. I will need to provide him of the tables and fields as desired for BW. I have already mapped the R/3 fields and the fields in the info source but does anyone now how to find the corresponding R/3 tables?
Unfortuneatly I can't use the R/3 extractor
Thanks in advance!
Pearl

Answer:
press F1 on the field in R3 then select technical info
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