When creating a service within a realm, any password fields will always appear on the initial configuration page for the service. This means that it is not longer possible to use the inherited value from the global default instance of the service.
For example, configuring the email service in the global configuration, with all the smtp settings means that the email service no longer asks for these properties when creating an instance, with the exception of the password. As the password is requested, if left blank then the service will no longer work.
List of services effected by this include