Hi Steffen,
Your sequence should have the following steps:
1) Open Database
2) Open SQL Statement
3) Data Operation
4) Close SQL Statement
5) Close Database
I am using a very basic stored procedure that doesn't really do anything:
CREATE PROCEDURE MySP @myInput int AS SELECT * FROM myTable GO
For step 2, your SQL Statement field should be the name of the stored procedure. In my example, it would simply by "MySP". Make sure you have the "Statement has parameters" field is checked.
For step 3, select "Execute" as the Operation. Under the Column/Parameter field, you can insert all of your parameters. In my case, I just have one parameter. I can refer to it by index (1) or name ("myInput").
Hope this helps!
Allen P.
NI