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I used the Secure Store to create connection in SharePoint 2010 Designer External Content Types Data Source Explorer. Later I changed some column names in the table.
I deleted the connection from Data Source Explorer and recreated it. I right clicked on the table and selected Create All Operations. When I clicked the Finish button, I got "The system definition with the same name as this data source already exists in the
Business Data Connectivity Metadata Store and it refers to a different data source. Cannot complete operation generation. Add a connection to this data source with a different name and try again."
I re-created the Secure Store using a different name in SharePoint 2010 Central Administration. I didn't find the option to choose the connection name in SharePoint 2010
Designer. After I clicked Add Connection, I entered the Database Server and the Database Name, selected Connect with Impersonated Window Identity, entered Secure Store name, and clicked OK. The connection created with the database name as before.
WCF: Consuming Claims-Enabled WCF Web Services as SharePoint 2010 External Content Types, Part 4 Learn how to use SharePoint Designer 2010 to consume a claims-enabled web service.
Kirk Evans shows how to take advantage of SharePoint 2010 Business Connectivity Services (BCS) to develop solutions with deep integration of external data and services. BCS builds upon its BDC predecessor in the key areas of presentation, connectivity, tooling and lifecycle management.
MSDN Magazine December 2009