Товар не добавляется в корзину

 <a href="<?echo $arElement["BUY_URL"]?>" rel="nofollow"><?echo GetMessage("CATALOG_BUY")?></a>

 $arLoadProductArray = Array(
                      "MODIFIED_BY"    => $USER->GetID(), // элемент изменен текущим пользователем
                      "IBLOCK_SECTION_ID" => false,          // элемент лежит в корне раздела
                      "IBLOCK_ID"      => $IBLOCK_ID,
                      "PROPERTY_VALUES"=> $PROP,
                      "NAME"           => $arEl["NAME"]." - ".$arRes[0]." - ".$arRes[1],
                      "ACTIVE"         => "Y",            // активен
                      "PREVIEW_TEXT"   => "",
                      "DETAIL_TEXT"    => "",
                      );

                    $PRODUCT_ID = $el->Add($arLoadProductArray);

                    //$arP = CCatalogProduct::GetByIDEx($PRODUCT_ID);
                    CPrice::SetBasePrice($PRODUCT_ID, $arRes[2], CCurrency::GetBaseCurrency());
                    CCatalogProduct::Update($PRODUCT_ID, Array("QUANTITY"=>"10"));