Make sure the stored procedure is being run in the correct database. By default, the Stored Procedure transformation uses the target database to run the stored procedure. Double-click the transformation in the mapping, select the Properties tab, and check which database is selected in Connection Information.

Check if the parameter to hold the return value is declared as OUTPUT in the stored procedure. With Microsoft SQL Server, OUTPUT implies input/output. In the mapping, you probably have checked both the I and O boxes for the port. Clear the input port.

The most common reason for problems with a Stored Procedure transformation results from changes made to the stored procedure in the database. If the input/output parameters or return value changes in a stored procedure, the Stored Procedure transformation becomes invalid. You must either import the stored procedure again, or manually configure the stored procedure to add, remove, or modify the appropriate ports.

Any changes you make to the Stored Procedure transformation may invalidate the session. The most common reason is that you have changed the type of stored procedure, such as from a Normal to a Post-load Source type.