Ядро D7 При изменении добавлении скидки изменять свойство товара

$eventManager = Bitrix\Main\EventManager::getInstance();
$eventManager->addEventHandler('sale', 'DiscountonAfterAdd', 'updateDiscountProps');
$eventManager->addEventHandler('sale', 'DiscountonAfterUpdate', 'updateDiscountProps');
// $eventManager->addEventHandler('sale', 'DiscountonAfterDelete', 'updateDiscountProps');
function updateDiscountProps() {
    if (CModule::IncludeModule('sale')){
        $result = Bitrix\Sale\Internals\DiscountTable::getList(array('filter' => array('LID' => 's1', 'ACTIVE' => 'Y')));
        while ($data = $result->fetch()) {
            if ($data['SHORT_DESCRIPTION_STRUCTURE']['VALUE'] >  0 ) {  // размер скидки в списке маркетинговых акций 
                foreach ($data['CONDITIONS_LIST']['CHILDREN'] as $arData) {
                    foreach ($arData [ 'CHILDREN' ]  as   $arElements ){  // получаем ID секций и элементов 
                        switch ($arElements [ 'CLASS_ID' ]) {
                            case 'CondIBSection':
                                $sectionsvalue[] = $arElements['DATA']['value'];
                            break;
                            case 'CondIBElement': 
                            foreach ($arElements['DATA']['value'] as $arElementsList) {
                                $elementsvalue[] = $arElementsList;
                            }
                            break;
                        }
                    }
                }
            }
        }
        function GetElementID($ibID, $sectID) { 
            if (CModule::IncludeModule('iblock')) {
                $arFilter = array(
                    'IBLOCK_ID' =>IntVal($ibID),  
                    'SECTION_ID' => $sectID , 
                    'INCLUDE_SUBSECTIONS'=>'Y', 
                    'ACTIVE' => 'Y' 
                ); 
                $res = CIBlockElement::GetList(array('RAND' => 'RAND'), $arFilter, false, false, array('ID'));
                while ($ob = $res->GetNextElement()) { 
                    $arFields[] = $ob->GetFields();
                }
                foreach ($arFields as $ids) {
                    $result[] = $ids['ID'];
                }
                return $result; 
            }
        }
        $CATALOG_ID = 2;
        if (empty($elementsvalue)) {
            $elementsvalue = array();
        }
        if (!empty($sectionsvalue)) {
            $FilterResult = GetElementID($CATALOG_ID, $sectionsvalue); // указываем ID инфоблока и передаем ID секций для выборки ID элементов 
        }else{
            $FilterResult = array();
        }
        $arFilterResult = array_unique(array_merge($elementsvalue, $FilterResult)); // объединяем массивы и удаляем одинаковые ID, если они есть
        foreach ($arFilterResult as $discountID) {
            CIBlockElement::SetPropertyValuesEx(
                $discountID, 
                $CATALOG_ID, 
                array(
                    'DISCOUNT' => 18 //Символьный код свойства список и его ID значение
                )
            );
        };
    }
}