Hi Daniel,
sorry for the late reply...
sorry for the late reply...
The idea behind is, when you are in the scope of an application, it's supposed to have the same look&feel in all the modules that belong to that app. So the baseline is always the first UI Module - that will have the theme (CSS). All the other modules will inherit the theme from it. That way, if you want to make a change on your CSS, you won't need to replicate the CSS on every module.
regards,
Vera
regards,
Vera