SAP BW has built-in ETL capabilities. If you exceed the ability of the built-in ETL, which it sounds like you might, you can also add-on an ETL tool into the BW architecture. Other than the fact that many are using DataStage for purpose of integration with BW, I would see this as an otherwise normal ETL tool decision.
Since you would be exceeding the capabilities of BW's ETL, I assume you would be looking at the more robust ETL tools available which would include DataStage and Informatica.
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