During design-time, to run the Reversemapping wizard, you can enable the Business.Entities project and specify the connection settings for the database that you want to reverse map. You can specify a different connectionid (say 'ConnectionDesigntime') from the one that you will use during runtime.
During runtime the connection from the web.config will be used since it would have a different connectionid.
All the best,
the Telerik team
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