Contact Work address AB, main address check box is disable mode

Hi ,

In Contact -> Work Address Assignment Block having Main address as check box which is always in Check mark & disable mode.

I want it should allow me to change or edit and unchecked  , check box of main address.

In the above Contact Workaddress screen i removed check mark from Main address and click on back button

in contact main screen Work address AB Main address column check box is in checkmarked and in disable mode even it was un checked.