Hello,
yes, I have all permissions.
I can edit all other views and forms, add new, delete, set defaultm active/inactive and so on.
Only the "Active T_D_STAMMS" isn't writeable:

It is not "default" anymore, I tried deactivated, in "classic view".
In classic view there is another error message:

And additional:

Of course I can add a new view and work with this new one.
Problem is: I cannot not delete entities or attributes, which in use in this view 😞
Greetings
AndKan.