Is it a BUG?

[cishpix]

Hi everyone,

I try create a simple BO only has an attribute, that's Date which I set the format is "dd MMMM yyyy" and a Locale that I set the Month Name is Indonesian which the Date Format of Locale is same "dd MMMM yyyy".

I can't input the data when I try on testing mode. It says "Attribute has invalid format". But I can input the data which I change the date format for attribute is "dd-MM-yyyy".

Is it a bug? You can find it on my attach.
Thanks