TÜV denied license plate too small !!!

Servus together, I currently have a small problem with the TÜV. My K1200R is currently at the annual inspection + TÜV. That’s when he called me on Friday and said that the examiner refused me the TÜV because my motorcycle is equipped with a registration plate for light motorcycles. The examiner wanted a special approval for this, which I did not have of course. However, the registration office assigned me these registration plates over 2 years ago. I was asked at that time if I had the one k The inspector now demands that I mount the pizza sheet to the stern. Has one of you had similar experiences? Can the TÜV examiner do that at all? Is his authority above that of an approval office? I would be grateful for any help! Greetings of the meiserli