anchor.diff:                <div class="col-xs-12 col-sm-3">
                   <div class="form-group">
                     <%= f.label :external_id, "External Id" %>
  -                  <%= f.number_field :external_id, class: "form-control", data: { guard: "required" } %>
  +                  <%= f.number_field :external_id, class: "form-control" %>
                   </div>
                 </div>
   
  
positive.code:           <div class="row">
              <div class="col-xs-12 col-sm-3">
                <div class="form-group">
                  <label for="external_id">External Id</label>
                  <input type="number" class="form-control" id="external_id" name="external_id" data-guard="required" value="<%= @donor.external_id %>" />
                </div>
              </div>
            </div>
  
negative.code: <% content_for :content do %>
    <%= javascript_tag do %>
      initializeExternalTypeSelector();
  
      function onExternalIdChange() {
        var value = $(this).val();
        $("#save_and_export").prop("disabled", value != "");
      }
  
      $(document).on("change", "#donor_external_id", onExternalIdChange);
      $(document).on("keyup", "#donor_external_id", onExternalIdChange);
  
      var externalIdGuard = $.guard("#donor_external_id").using("never").message("This is required when not exporting.")
  
      $(document).on("click", "#save", function(e) {
        var valid = $(this).parents("form:first").guard();
        var externalId = $("#donor_external_id").val();
  
        if (!$.guards.isPresent(externalId)) {
          externalIdGuard.triggerError("#donor_external_id");
  
          if (valid) {
            $("#donor_external_id").focus();
          }
  
          valid = false;
        }
  
        if (!valid) {
          e.preventDefault();
        }
      });
    <% end %>
  
    <div>
      <ul class="nav nav-pills" role="tablist">
        <li role="presentation" class="active"><a href="#netsuite-import" aria-controls="netsuite-import" role="tab" data-toggle="pill">Import From NetSuite</a></li>
        <li role="presentation"><a href="#manual-creation" aria-controls="manual-creation" role="tab" data-toggle="pill">Create</a></li>
      </ul>
  
      <br />
  