writeoffamountvalidator.php

См. документацию.

<?php
 
namespace Bitrix\Catalog\Document\Action\Store;
 
use Bitrix\Catalog\Document\Action\ProductAndStoreInfo;
use Bitrix\Catalog\EO_StoreDocumentElement;
use Bitrix\Main\Error;
use Bitrix\Main\Localization\Loc;
use Bitrix\Main\Result;

trait WriteOffAmountValidator
{
    use ProductAndStoreInfo;
 
    protected function checkStoreAmount(EO_StoreDocumentElement $storeDocumentElement = null): Result
    {
        $result = new Result();
 
        if (empty($storeDocumentElement))
        {
            $result->addError(new Error(Loc::getMessage("CATALOG_STORE_EMPTY_DOC_ELEMENT")));
 
            return $result;
        }
 
        if ($this->getStoreProductAmount() - $storeDocumentElement->getAmount() < 0)
        {
            $message = Loc::getMessage(
                "CATALOG_STORE_DOCS_ERR_INSUFFICIENTLY_AMOUNT_EXT",
                [
                    "#STORE#" => $this->getStoreName(),
                    "#PRODUCT#" => $this->getProductName(),
                ]
            );
 
            $result->addError(new Error($message));
        }
 
        return $result;
    }
}