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Creating InfoSources (R/3 Source System) 
Use
Instead of creating a new InfoSource, you can copy one from SAP
Business Content.Procedure
Select the InfoSource tree of the Administrator Workbench to create InfoSources for an R/3 source system. Using the context menu, choose Create InfoSource from the relevant application component.
You can also use an existing InfoSource as a template.
Transfer structure maintenance automatically appears.
The system will automatically offer you suitable transfer rules, but you can modify these.
Result
The InfoSource is now saved and active.
See also:
Maintaining InfoSources (Flat Files) Maintaining InfoSources (External System)