You can also setup the rights on the pages themselves. To show up on module security, the page must be used in the navigation or from another page.
Answer to new questions: If you use role customer to secure your page, that module role must be added to a user role in the project security. After that, add that role to a user if your user does not already have that user role.
Useful documentation links:
many thx. I understood, that you need to add a page to the navigation or triggered it from another page in order to get the entery in module security.
Setting up the rights on the pages themselves: Here I can go to edit page > navigation visible for... and select user roles, that should be allowed to see the page. Do you mean this part?
In sum, I still cannot allow users with the role "customer" to envoke the "TravelRequest_EditNew" page. I do the following
Any idea is very welcome ;)