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How to do it...

In SSDT, open the AdventureWorksETL.sln solution located in the C:\SSIS2016Cookbook\Chapter06\Starter\AdventureWorksETL\ folder.
Make sure that the CascadingLookup.dtsx SSIS package is open, locate the Resolve Client Data task in the control flow, and open it in the data flow designer.
The data flow contains one source component named Source Client Data that extracts client data from a flat file.
Double-click the source component to open the Flat File Source editor, and on the Connection Manager page, click Preview... to inspect the source data.

The source contains a single column with a list of clients, and no other information about them.

Click Close to close the Data View window, and then click Cancel to close the ...

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