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AddEventHandler('main', 'OnAdminTabControlBegin', 'MyOnAdminTabControlBegin');
   function MyOnAdminTabControlBegin(&$form)
   {
      if($GLOBALS['APPLICATION']->GetCurPage() == '/bitrix/admin/sale_order_detail.php')
      {
         $curHTML = $form->arFields['ORDER_PROPS']['custom_html'];
         
         $orderID = $_GET['ID'];
         if(intval($orderID) > 0 AND CModule::IncludeModule('sale'))
         {
            $arOrder = CSaleOrder::GetByID($orderID);
            $userID = $arOrder['USER_ID'];
            
            if(intval($userID) > 0)
            {
               $arUser = CUser::GetByID($userID)->Fetch();
               $adminNotes = $arUser["ADMIN_NOTES"];
               
               $newHTML = '<tr>
                  <td valign="top">Заметки администратора:</td>
                  <td valign="middle">' . $adminNotes . '</td>
               </tr>' . $curHTML;
               
               $form->arFields['ORDER_PROPS']['custom_html'] = $newHTML;
            }
         }
      }
   }

<?
AddEventHandler("main", "OnAdminTabControlBegin", "MyOnAdminTabControlBegin");
function MyOnAdminTabControlBegin(&$form)
{
    if($GLOBALS['APPLICATION']->GetCurPage() == '/bitrix/admin/sale_order_detail.php')

    {
        $form->tabs[] = array("DIV" => "my_edit", "TAB" => "Дополнительно", "ICON"=>"main_user_edit", "TITLE"=>"Дополнительные параметры", "CONTENT"=>
            '<tr valign="top">
                <td>Дополнительные заголовки письма:</td>
                <td>
                    <input type="text" name="MY_HEADERS[]" value="" size="30"><br>
                    <input type="text" name="MY_HEADERS[]" value="" size="30"><br>
                    <input type="text" name="MY_HEADERS[]" value="" size="30"><br>
                </td>
            </tr>'
        );
    }
}
?>