shipmentproperty.php

См. документацию.

<?php
 
namespace Bitrix\Sale\Controller;
 
use Bitrix\Sale\Registry;

class ShipmentProperty extends Property
{
    protected function getPropertyClassName(): string
    {
        return \Bitrix\Sale\ShipmentProperty::class;
    }

    protected function getEntityType(): string
    {
        return Registry::ENTITY_SHIPMENT;
    }
}