Hi Période financière was not a variable. I tried storing the value in a vPériodefinancière variable to test what you were stating and I did not get a proper result for the above mentionned synthax with a -1.
I'll try and test it later when I actually have time to experiment further.
Also, this relates to a question I was asking with alternate states:
I am trying to retrieve a selection from the default alternate state and storing it to a variable to use in a set analysis of a "comparative" alternate state. If you find something there, it seems I'm never able to use variables in set analysis, and I'm getting frustrated .