Japan Address Layout

This module changes how addresses are entered on contact (partner) forms when the country is Japan. Instead of the standard Western order, the form shows the postal code first with the 〒 mark, then the prefecture (state), then the city, then the street lines, and finally the country.

• The Japanese address layout is registered as the address form used for Japan, so it appears automatically on contact records whose country is Japan.
• The prefecture field is linked to the country and postal code, so the list of prefectures offered matches the selected country.
• The country field is read-only in the sense that users cannot create new countries from this form; they can only pick an existing one.
• The prefecture field also prevents opening the related record or creating a new prefecture on the fly, keeping the list clean.

It touches the res.partner model (contacts and companies) and the country configuration. No new menus, buttons, reports or automated rules are added; the change is purely the layout and behaviour of the address block on the contact form.