Hi Abhilash,
I had no quotes that´s why!!! 
Stupid beginner me!!
So I am through with it apart from 13) "You should now have the prompt presented with a list of values to choose from."
I get a first prompt to ask for user and pwd, I guess this will only be in the preview.
After giving user and pwd I get a second prompt which is ok so far:
but there is no value option with dropdown!!
So right now, I have to enter the values manually with quotes 
The groupkeys are provided in a formula on branch_sc. Do I need to consider something in the parameter about that?
rgds
Eberhard