Extract structure and table

Hi Experts,
How to know the fields of a extract structure are populated data from which tables?
Thanks,
Bill

Hi,
Datasource / tables in the source system
Go to RSA2 (DS Repository) in your source system and display your source system.
If Extraction Method is 'V' - you are lucky and you see table name where data is taken from.
If it is F* - function module is used, and you have to go thru its code to see all the tables it uses and logic how data is
processed.
Ext. Meth   Short text
V                 Transparent Table or DB View
D                  Fixed Domain Value
F1                Function Module (Complete Interface)
F2                Function Module (Simple Interface)
Q                 Extraction Using ABAP Query
A                 DataSource Append
or
Table ROOSOURCE in ERP.
Relevant fields EXMETHOD, EXTRACTOR.
IF EXMETHOD = V, EXTRACTOR is view or tablename
IF EXMETHOD = D, EXTRACTOR is name of domain
IF EXMETHOD = F1, F2 EXTRACTOR is name of FM
IF EXMETHOD = Q EXTRACTOR is name of Info set
OR
Since you have the extract structure and the extractor, you must have some transaction like the Extractor Checker RSA3. If so
then execute ST05, switch on the trace and execute the extractor checker. Once the extractor checker presents the results
switch off trace. The clcik on Display trace and you will see all the tables that were hit by the extractor checker to
retrieve data and present it to you.
Thanks,
JituK

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Hi:
I am pasting a summarized def. from sap notes.
http://help.sap.com/saphelp_bw30b/helpdata/en/ad/6b023b6069d22ee10000000a11402f/frameset.htm
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