You have selected a database object from an unsupported database provider
The Object Relational Designer (O/R Designer) supports only the .NET Framework Data Provider for SQL Server (System.Data.SqlClient). Although you can click OK and continue to work with objects from unsupported database providers, you may experience unexpected behavior at run time.
Only data connections that use the .NET Framework Data Provider for SQL Server are supported.
To correct this error
Click OK to continue designing the entity classes that map to the connection that uses the unsupported database provider. You might experience unexpected behavior when you use unsupported database providers.
The action is stopped. Create or use a data connection that uses the .NET Framework Provider for SQL Server.