How to make a field mandatory in Fiori App?

We have a simple fiori app in solman knows as Create Incident, which basically allows end user to report CRM incident. My question is how to make some input fields as mandatory in the Create Incident app ?

In the app, one of the fields (Title) is a mandatory field by default. I would like to make Configuration Item also as mandatory field. Could you throw some lights here on how to do. Please consider, I am a novice when it comes to Fior/UI5 development, so if you could explain me or give me some hints then I would read and figure out :)

Thanks,

Vivek