Роман Грицук

while( $ob = $res->GetNextElement() ) {
      $arFields[] = $ob->GetFields();//Тут ошибка. эта переменная используется в качестве параметра функции addProperty. 
}

function addProperty(&$arFields)
{

    // Выбираем опции
    $arOrder = Array(
        "SORT" => "ASC"
    );


    $arSelect = Array(
        "ID",
        "IBLOCK_ID",
        "CODE",
        "NAME",
        "PROPERTY_OPTION_TYPE",
    );


    $arFilter = Array(
        "IBLOCK_ID" => '19',
    );


    $res = CIBlockElement::GetList(
        $arOrder,
        $arFilter,
        false,
        false,
        $arSelect
    );

    $counter = 0;
    while ($ob = $res->GetNextElement()) {
        $arItem = $ob->GetFields();
        $arFields['PROPS'][$arItem['CODE']] = [
            'CODE' => $arItem['CODE'],
            'VALUE' => '1',
            'SORT' => $counter += 100,//Про сортировку свойств не надо забывать. ID был лишним.
            'NAME' => $arItem['NAME'],
        ];
    }
}

\Bitrix\Main\Loader::includeModule("iblock");
\Bitrix\Main\Loader::includeModule("catalog");
\Bitrix\Main\Loader::includeModule("sale");

$ordersIds = array_column(\Bitrix\Sale\Internals\BasketTable::getList([
    "select" => [
        "ORDER_ID"
    ],
    "filter" => [
        "!ORDER_ID" => false,
        "PRODUCT.IBLOCK.IBLOCK_ID" => $IBLOCK_ID//Тут надо задать ID вашего каталога
    ],
    "group" => [
        "ORDER_ID"
    ]
])->fetchAll(), "ORDER_ID");

<?php

\Bitrix\Main\Loader::includeModule("catalog");

$allProductPrices = \Bitrix\Catalog\PriceTable::getList([
    "filter" => [
        "PRODUCT_ID" => $productId,
    ]
])->fetchAll();

$bxEventManager = \Bitrix\Main\EventManager::getInstance();

        $bxEventManager->addEventHandler(
            'sale',
            'OnSaleShipmentEntitySaved',
            array(
                "\\Gricuk\\Shipment",
                "onSaleShipmentSavedHandler"
            )
        );

<?php
namespace Gricuk;


use Bitrix\Main\Event;
use Bitrix\Main\EventResult;
use Bitrix\Main\Result;

class Shipment
{
    public static function onSaleShipmentSavedHandler(\Bitrix\Main\Event $event)
    {
        /** @var \Bitrix\Sale\Shipment $shipment */
        $shipment = $event->getParameter("ENTITY");
        $oldValues = $event->getParameter("VALUES");

        $shipmentFields = $shipment->getFieldValues();
        /**
         * Ключ - статус ДОСТАВКИ
         * Значение - статус ЗАКАЗА
         */
        $statusMap = [
            "DR" => "F",
            "DB" => "RS"
        ];
        if (isset($statusMap[$shipmentFields["STATUS_ID"]])) {
            try {
                $orderId = $shipment->getParentOrderId();
                $order = \Bitrix\Sale\Order::load($orderId);
                $order->setField("STATUS_ID", $statusMap[$shipmentFields["STATUS_ID"]]);

                /** @var Result $saveResult */
                $saveResult = $order->save();
                if (!$saveResult->isSuccess()) {
                    \Bitrix\Main\Diag\Debug::dumpToFile($saveResult, '$saveResult', 'onSaleShipmentSavedHandler.log');
                }
            } catch (\Exception $e) {
                \Bitrix\Main\Diag\Debug::dumpToFile($e, '$e', 'onSaleShipmentSavedHandler.log');
            }
        }
    }
}

Array
(
    [6197] => S1076
    [6181] => S1024
    [7345] => S1237
    [6192] => S1067
    [7455] => S1158
    [8831] => 7386
    [8830] => 7385
    [8829] => 7384
    [8828] => 7383
)