Oracle Fusion Page composer - Required filed not checking NULL value

Summary:

I have made the field as required using page composer , but I didn't get any error msg if the field is NULL.

I am trying this on field "Customer Classification" in "Create Customer" page using "Page Composer - Structure - Required"

But it is showing * as mandatory but you don't select anything on this field and move to next and save, it is not showing any error for required field.