anchor.diff:  <% content_for :content do %>
     <%= javascript_tag do %>
       initializeExternalTypeSelector();
  +
  +    function onExternalIdChange() {
  +      var value = $(this).val();
  +      $("#save_and_export").prop("disabled", value != "");
  +    }
  +
  +    $(document).on("change", "#organization_external_id", onExternalIdChange);
  +    $(document).on("keyup", "#organization_external_id", onExternalIdChange);
     <% end %>
   
     <div>
  
positive.code: 
            <%= render partial: "organizations/new_address" %>
            <%= f.submit "Save", class: "btn btn-primary" %>
            <%= link_to "Cancel", organizations_path, type: "button", class: "btn btn-default" %>
          <% end %>
        </div>
  
negative.code:               <%= f.telephone_field :phone_number, class: "form-control", data: { guard: "required phoneUS" } %>
              </div>
  
              <div class="row">
                <div class="col-xs-12 col-sm-9">
                  <div class="form-group">
                    <%= f.label :external_type %>
                    <%= f.select :external_type, options_for_select(external_types_for_select, "Organization"), { include_blank: true }, { id: "external-type", class: "required", data: { guard_required_target: "#external-type-error-target" } } %>
  
                    <div id="external-type-error-target"></div>
                  </div>
                </div>
  
                <div class="col-xs-12 col-sm-3">
                  <div class="form-group">
                    <%= f.label "External Id" %>
                    <%= f.number_field :external_id, class: "form-control" %>
                  </div>
                </div>
              </div>
  
              <div class="form-group">
  