They are already enshrined in the German Banking Act and are partly written into the laws governing savings banks. Compliance with them is monitored by the supervisors. In practise, this means that members of these boards will have acquired the necessary specialist skills either during their training period or in the course of their professional career or, alternatively, in follow-up courses.
I fear as, Simon Sinek explains in his book "Start With Why," we get caught up too often with the "what will we do and how will we do it" (for instance, this campaign) and ignore the all important question of why we are doing this.