Marking angle

Hello people Have a question I installed on my mopped 15 years ago a short, TÜV approved rear. The rear is also registered. The license plate angle is due to the conversion, about 40 degrees. The rear is now as said 15 years, and I had never had Probs. at the TÜV because of the angle. Did a police car overtake me yesterday and stopped me. The bull made an uprising because of the license plate angle and threatened with points and fines. On my Objection to the fact that the thing was released from the TÜV, quote: “This is only an association, they have nothing to say” Yes, what ́n now! His colleague then kindly let me run with a warning.