Sorry Daniel, I am not satisfied with your answer. In my posted example there are 3 flows on 3 pages. Then I make the frame break on page 2 and - not surprisingly - now I have 4 pages. Because the override in page 3 doesn’t automatically move to the next page (why not?) I insert a page after page 2. And now the override moves - as wanted - to page 4. Interesting: althoug I inserted a new page there are still 4 pages, not 5 (again: why?). This looks all a little bit strange to me. With Adobe InDesign I never had such anomalies.