Okay Sorry, but I’m still working on a solution.
I want to avoid the error message in the add dialog.
My question is: When is the check done if the slug for creating a page exists.
Is it possible to run a hook / function before the error message is triggered.
I already tried to modify the parent page create method and the page is saved with a suffixed slug, but the error message in the add dialog remains.
Any ideas or hints how to solve this?