Hi Marco,
Thank you very much for explaining your problem so clearly. Most people just write 2/3 lines for their problem.
This is what I understood.
Users run the workbook. In the variable screen they see the values put by the developers. Here we are talking about Authorization variables only. We want the authorization to be filled in by their own authorization data and not the developers or not what was saved.
Then there is an option for this in Query Designer. Select the characteristics in the query designer. In the properties tab called "Extended" change the radio button for "Refresh Variables" to "Refresh as designed". See the screen shot attached.
Sujit.