Delphi TMSStoredProc parameter issues

Hello, we are replacing ADO with SDAC in our application. I cannot get one thing work..

myAdvStoredProcedure := TMSStoredProc.Create(nil);

myAdvStoredProcedure.StoredProcName := 'GetCustomerTest';

myAdvStoredProcedure.Params.Clear;

myAdvStoredProcedure.Params.CreateParam(ftInteger, '@CustomerID', ptInput).AsInteger := 1111;

(i also tried 'CustomerID' as parameter without the @ character)

myAdvStoredProcedure.Execute; (I also tried myAdvStoredProcedure.Open);

Is get the error 'No value given for one or more required parameters'

But i only have one param..

I tried everything but i cannot find what i am doing wrong..

The stored procedure :

CREATE PROCEDURE [dbo].[GetCustomerTest]

@CustomerID INT

BEGIN

-- Select the employee name based on the EmployeeID provided

SELECT Name

FROM Customer

WHERE ID = @CustomerID;

END;