Magento 2.4 product stock status not change after salable quantity become zero

There are some steps missing from the steps described, but the essential one is shipping items, if the order was placed but is still waiting to be shipped the product won't become out of stock, because it is still in your stock.

Here's a reference about the MSI workflow: How does the Magento salable quantity calculation work for merchants?

But if you use external systems to sync stock (as just salable items) or process your orders returns or shipments through a different system, then you need to disable the stock reservation, this module will handle it: https://github.com/AmpersandHQ/magento2-disable-stock-reservation

This is my hotfix.

Create extension Lexim_InventoryConfigurableProduct

etc/di.xml

<?xml version="1.0"?> <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd"> <type name="Magento\Inventory\Model\SourceItem\Command\DecrementSourceItemQty"> <plugin name="update_parent_configurable_product_stock_status_in_legacy_stock" disabled="true"/> <plugin name="update_parent_configurable_product_stock_status_in_legacy_stock_fix" type="Lexim\InventoryConfigurableProduct\Plugin\InventoryApi\UpdateParentStockStatusInLegacyStockPlugin"/> </type> </config> 

Plugin\InventoryApi\UpdateParentStockStatusInLegacyStockPlugin.php

<?php /** * Copyright © Magento, Inc. All rights reserved. * See COPYING.txt for license details. */ namespace Lexim\InventoryConfigurableProduct\Plugin\InventoryApi; use Magento\Framework\Exception\NoSuchEntityException; use Magento\Inventory\Model\SourceItem\Command\DecrementSourceItemQty; use Magento\InventoryApi\Api\Data\SourceItemInterface; use Magento\InventoryCatalogApi\Api\DefaultSourceProviderInterface; use Magento\InventoryCatalogApi\Model\GetProductIdsBySkusInterface; use Magento\ConfigurableProduct\Model\Inventory\ChangeParentStockStatus; /** * Apply a fix for update configurable product stock status in legacy stock * after decrement quantity of child stock item */ class UpdateParentStockStatusInLegacyStockPlugin { /** * @var DefaultSourceProviderInterface */ private $defaultSourceProvider; /** * @var ChangeParentStockStatus */ private $changeParentStockStatus; /** * @var GetProductIdsBySkusInterface */ private $getProductIdsBySkus; /** * @param DefaultSourceProviderInterface $defaultSourceProvider * @param GetProductIdsBySkusInterface $getProductIdsBySkus * @param ChangeParentStockStatus $changeParentStockStatus */ public function __construct( DefaultSourceProviderInterface $defaultSourceProvider, GetProductIdsBySkusInterface $getProductIdsBySkus, ChangeParentStockStatus $changeParentStockStatus ) { $this->defaultSourceProvider = $defaultSourceProvider; $this->getProductIdsBySkus = $getProductIdsBySkus; $this->changeParentStockStatus = $changeParentStockStatus; } /** * Make configurable product out of stock if all its children out of stock * * @param DecrementSourceItemQty $subject * @param void $result * @param SourceItemInterface[] $sourceItemDecrementData * @return void * @throws NoSuchEntityException */ public function afterExecute(DecrementSourceItemQty $subject, $result, array $sourceItemDecrementData): void { $productIds = []; $sourceItems = array_column($sourceItemDecrementData, 'source_item'); /** @var SourceItemInterface $sourceItem */ foreach ($sourceItems as $sourceItem) { $sku = $sourceItem->getSku(); if ($sourceItem->getSourceCode() === $this->defaultSourceProvider->getCode() && $productId = ($this->getProductIdsBySkus->execute([$sku])[$sku] ?? null) ) { $productIds[] = (int) $productId; } } if ($productIds) { $this->changeParentStockStatus->execute($productIds); } } } 

registration.php

<?php \Magento\Framework\Component\ComponentRegistrar::register( \Magento\Framework\Component\ComponentRegistrar::MODULE, 'Lexim_InventoryConfigurableProduct', __DIR__ ); 

module.xml

<?xml version="1.0"?> <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd"> <module name="Lexim_InventoryConfigurableProduct" setup_version="1.0.0" /> </config> 

I hope you can fix the error!