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Problems with stored procedure

Hi All.
 
 
I have a problem with calling a stored procedure on my MSSQL server, I have tested the following sql query in studio express, and it works very well.
 
declare @RetMacNr varchar(20)
Exec GetMacNr @RetMacNr = @RetMacNr output, @boardSN =  '1234'
select @RetMacNr as nbr
 
The problem is that after I have executed the step "open SQL statement", then the number of records returned is -1. So no errors, if I try to remove one of the first 2 lines then the step is failing, so it doesn't seems to be a problem with the step can't handle more sql lines in one step.
 
Why will the step dont return the output variable..... it should....
 
I can see on the forum that you also can call a stored procedure with SQL action step.....
 
Can anybody help me with my problem, or can anybody help me with an example of how I can call a stored procedure with the SQL action step.....
 
Damn the manual is bad.... no help at all on these steps..
 
/Thomas
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