You are using an Entity Data Model (EDM) that maps entity types to tables in a Microsoft SQL Server database. You need to ensure that your application can use an EntityCommand to call a stored procedure to query the database.

What should you do?

To execute a stored procedure, the procedure must be included in the EDM. A FunctionImportMapping is used to import stored procedures that return result sets.

Configuring the connection string to enable MARS is unrelated; it has no effect on mapping a stored procedure.