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AddEventHandler("main", "OnAdminTabControlBegin", "MyOnAdminTabControlBegin");
function MyOnAdminTabControlBegin(&$form)
{
    if($GLOBALS["APPLICATION"]->GetCurPage() == '/bitrix/admin/sale_order_view.php')
    {         
         $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"];
               
               
               $form->tabs[] = array("DIV" => "my_edit", "TAB" => "Заметки", "ICON"=>"main_user_edit", "TITLE"=>"Заметки о покупателе", "CONTENT"=>
            '<tr valign="left">
                <td>Заметки администратора:</td>
               <td valign="left">' . $adminNotes . '</td>
            </tr>');
            }
         }
      
    }
}