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Certainly. You can run BW without R/3 implementation. You can use
pre-defined business content in BW using your non-SAP data. Here you simply
need to map the transfer structures associated with BW data sources
(InfoCubes, ODS tables) to the inbound data files or use 3rd part tool to
connect your flat files and other data sources and load data in BW. Several
third party ETL products such as Acta, Infomatica, DataStage and others will
have been certified to load data in BW.
Recently, SAP signed an agreement with DataStage folks to bundled-in the
DataStage ETL product in BW 3.0x. This will automate and simplify non-SAP
R/3 data source integration with BW.
In my book "Business Information Warehouse for SAP", I have one full
chapter on how to load data using flat files and another chapter on how to
use 3rd Party ETL products (Informatica for example) to load non-R/3 data in
BW. Take a look at these chapters. They will answer your questions.
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