Hä?! “Book an appointment for maintenance” at 9,000 KM driven

Hello together, since this morning I have been shown in the display “Book appointment for maintenance”. Even though I only drove about 9000 km with the car. KM stand is now at just over 48000, the 40,000 inspection was preferred at 39,000 km. I bought the car used in February. Can you tell me what this is about? In advance best thanks for your help and many greetings Sebastian