Recently CRM Up gradation from 2011 to 2013, in CRM 2011 Address fields (Address Street1, Address Street2, Address Street3, ZIP/Postal Code, City, State and Country/Region) some fields is via Lookups (City, State and Country/Region), it is mentioned on the form but, in CRM 2013 default Address composite field combined all the 7-fields;(Address Street1, Address Street2, Address Street3, ZIP/Postal Code, City, State and Country/Region) mentioned on the form but I cannot replace default fields (City, State and Country/Region) with their new Lookups if we use to Business Rule then I can hide default fields (City, State and Country/Region) and also can mention the rest 3 new Lookups under same section.