One more question though: I’m creating a new user role called ‘Equilli Brugge’. This person should have access to 3 specific pages, a custom post type (called ‘nieuws’) and the Booked plugin appointments.
Here’s the problem:
When I activate “Force custom post types to use their own capabilities”, this user has access to the ‘nieuws’ custom post type, but can’t access the Booked plugin. When I disable “Force custom post types to use their own capabilities”, the user has access to the Booked plugin, but not the ‘nieuws’ posts.
The universal scenario when you don’t know what capability protects custom post type, look for that using Admin menu access add-on. Open it for ‘Administrator” role and look what capability protects needed menu item. Grant that capability to the selected role then. If this is a ‘edit_posts’, but you don’t need that this role access to the posts, except ‘nieuws’, then block unneeded menu items, like ‘Posts’ menu with the same “Admin menu access” add-on.