Country Region Codes Not working on Extension Level

HI ALL

I have requirement to implement Country region code on one form, To achieve this requirement i entered the Country ISO code on   Country Region Codes property on both element (Table and on form) . but fields are still showing...  I have performed full compiled and DB Sync as well but no result...

Kindly check  the screen shots

ISO of Pakistan Is PK

following is form screenshot where i entered Country region Code

following is Table field screenshot where i entered Country region Code

But still field and tab are showing