Question on the flow of the data from SAP R/3 to SAP BW

hai bwgurus,
I am learner of  sap bw ,i have small doubt in the extracting the data from sap r/3 to sap bw  i.e
Extraction is always performed only on master data table not on transaction table , Am I right or wrong pls correct me with an detailed explanation ?
EmailId:[email protected]
Regards
Raju

Hi raju,
Extraction is always on Masterdata and as well as transaction data.
a transaction is event that ocurs on masters(like business example would be there will be a distributor who orders certain quantity of material so Disturbutor will be the companies sole distrubutor who comes under master and transaction data is the qty of materila he purchsed).All the transactions occur in SAP r/3 and that data will be replicated to BW for Data ware hosue and reporting.
Reg
Ram
""assign points if it helps""

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