Hello Florian,
Version 2018.1 of the Thinkwise Platform has revised the authorisation of administrators in the Intelligent Application Manager.
This list provides an overview of the different types of administrators and their capabilities.
In your particular case, several Application owners should be configured. An Application owner cannot configure users (including him- or herself) to be Application owner for an application. Only Application administrators and Main administrators can do this.
Does this answer your question?
This answers my question. Thank you.