The Student Union regularly takes decisions, which have consequences for individuals and/or groups (associations, organizations). The Student Union board tries of course to weigh the consequences of a decisions to make the right one. Still, there is a possibility that your interests were not recognized enough. If you're not agreeing with a decision, you can present your protest to the Student Union board, as described in article 4 of the basic regulation. The board will decide if they meet the protest or not.
When you're not satisfied after your protest has been treated, you can appeal by the Supervisory Board of the Student Union. You can find in article 4 how this works.