Finding Datasource from fieldname

Hi Experts,
           I am new to BW and have a question. Users come asking with field names from the tables that they want to see in the data extractors. 
          How can I find out if that particular field is already available in the any of existing data sources ? Is there any table that I can see to find out if that particular table field is already being extracted. Pl. remember that we do not know the datasource name .. so how do I find out that ?

Hi Sunil ,
Easy way to do this is using DD03VV table .
In SE11 Tcode  open this table and give fields name in selection .It will show you list of all tables have those fields .
You can further narrow down your search on table type (internal,transparent ,pool etc ).
This will also tell you PSA ,DSO tables also which contain that field .
Hope this will be helpful .
Regards,
Jaya Tiwari

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