In an important change to manage your adword account locations extensions faster and easier, Google will now use local extensions stored in your Google Business Account.
So what is changed for you as AdWords account manager, if you are using Google Local Extensions, now you will have to update locations at your “Google My Business Account” as compared to before which was being managed within AdWords account. Google will use same address and locations defined at your business account level (formerly Google Places for Business).
So if you have any extension which is manually defined in your account, Google will remove those, Google also said that non-updated extensions will be removed from your account.
With this updated feature you will be able to manage your local address edits, deletions and updations for Google Maps and Adwords from single place within your Google Business Account.