addresslinkcollection.php

См. документацию.

<?php
 
namespace Bitrix\Location\Entity\Address;
 
use Bitrix\Main\ArgumentTypeException;

final class AddressLinkCollection extends \Bitrix\Location\Entity\Generic\Collection
{
    protected $items = [];

    public function addItem($linkedEntity): int
    {
        if(!($linkedEntity instanceof IAddressLink))
        {
            throw new ArgumentTypeException('linkedEntity must implement IAddressLink');
        }
 
        return parent::addItem($linkedEntity);
    }
}