User Role: Page error

Hi,

I′ve created a user called “cms”, who uses the backend to edit pages and posts. So far so good.

But if the user edit a special page, the result is in the frontend:
“Tut uns leid, aber dieser Inhalt kann nur mit ausreichender Berechtigung angezeigt werden.” = “Sorry, you have no permission to display the page”…

This error is only displayed in one page, the others work. The way was: Me, as an admin was logged in. The user “cms” was logged in. He overtakes the page and get a message “Dieser Inhalt ist momentan blockiert. Wenn du übernimmst, wird (Admin) daran gehindert, weiter zu schreiben.” = “The content is temporarily blocked. If you overtake, the (admin) is prevented to proceed to write…”

How can we avoid this role/permission errors? I think, I give all the right permissions in the backend and can′t find the mistake.

Thanks!