Relation between master and transaction data

Hi experts,
I have a basic question how the relation between masterdata and transction data is maintained in R/3. As I know first we extract master data and later transaction data in a typical R/3 based scenario.
1.How does BW knows that , the transaction data are  related masterdata in the same sense as in R/3 ?
I am involved in an enhancement of R/3 extractor. I need to derive 3 more fields and map it to info objects in BW. Cld any one explain me ( with an example plz) how these alignments to be made. How can I establish relation b/w derived fields and transaction data during extractions ?
regs
D Bret

Hi Dave.
Let's see if I can get all of your questions answered.  First, when Transactional Data is loaded, BW checks to see if a SID exists for each characterisatic field & value in the load.  If one doesn't, it either creates a SID (Surregate ID) in the master data tables (default action) or the load fails (if the enforece referential intgegrity flag is set).  It's better to load master data first in either case as it will improve the performance of the transactional load.
In terms of R/3, the data has similar relationships as in BW.  There are master data tables and transactional data tables.  The difference is that while R/3 uses ~1 master data table per field, BW uses more.  Same thing for transactional data.
As for your enhancement, if everything you need for the derivation of the extra field is in R/3, then you can enhance the extractor in RSA6 and do the mapping in R/3.  Once you replicate the DataSource to BW and reconnect the transformation & update rules, the load should work.  If you can give a bit more information on what sort of enhancement you are attempting, I can give a better example.
Cheers,
Adam

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