build 070717

When RE the enum  below, there is no any element created in the uml project tree.
There is not any error dialog nor error in  message.log  . 

 public enum Month {
    JANUARY(31),
    FEBRUARY(28),
    MARCH(31),
    APRIL(30),
    MAY(31),
    JUNE(30),
    JULY(31),
    AUGUST(31),
    SEPTEMBER(30),
    OCTOBER(31),
    NOVEMBER(30),
    DECEMBER(31);
    
    private int dayNumber;
    
    private Month(int dayNumber){
        this.dayNumber = dayNumber;
    }
    
    public int getDayNumber(){
        return dayNumber;
    }
    
}