city/post missing in BP description

Hi,         

I use function BUPA_DESCRIPTION_GET to get business partner's description, normally it contains standard address's city and post info. E.g. "customer name street/600500".

But I found currently if country is "MX"(Mexico), I can't get city/post via function module. But if address country is "DE"(Germany), I can get city/post in BP description. I'm wondering whether there's any customizing missing in system. Do you know it?

Thanks a lot in advance!