Hallo Jürgen,
I modified your SmartPart to get what you want.
For the total of the values (subtraction in your case), you have not to add quotes ("). Quotes means that you use a string, not a parameter.
I optimized your 2D script to avoid to have lots of IF...THEN and reduced the number of variables.
In the dialog script, you could avoid to define the position (row) because you use the palette.
So, you could write your lines like that:
I_OUTFIELD `Listenausgabe` , 0 , 0 , txt_width , controlheight , 1
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