diff --git a/InventorySales/Plugin/Quote/Api/ValidateQtyBeforeSave.php b/InventorySales/Plugin/Quote/Api/ValidateQtyBeforeSave.php
new file mode 100644
index 000000000000..ec4101481367
--- /dev/null
+++ b/InventorySales/Plugin/Quote/Api/ValidateQtyBeforeSave.php
@@ -0,0 +1,65 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\InventorySales\Plugin\Quote\Api;
+
+use Magento\CatalogInventory\Model\Quote\Item\QuantityValidator;
+use Magento\Framework\Event;
+use Magento\Framework\Event\Observer;
+use Magento\Framework\Event\ObserverFactory;
+use Magento\Framework\Exception\LocalizedException;
+use Magento\Quote\Api\CartItemRepositoryInterface;
+use Magento\Quote\Api\Data\CartItemInterface;
+
+/**
+ * Validate item qty before save.
+ */
+class ValidateQtyBeforeSave
+{
+    /**
+     * @var QuantityValidator
+     */
+    private $validator;
+
+    /**
+     * @var ObserverFactory
+     */
+    private $observerFactory;
+
+    /**
+     * @param QuantityValidator $validator
+     * @param ObserverFactory $observerFactory
+     */
+    public function __construct(QuantityValidator $validator, ObserverFactory $observerFactory)
+    {
+        $this->validator = $validator;
+        $this->observerFactory = $observerFactory;
+    }
+
+    /**
+     * @param CartItemRepositoryInterface $subject
+     * @param CartItemInterface $item
+     *
+     * @return array
+     * @throws LocalizedException
+     */
+    public function beforeSave(CartItemRepositoryInterface $subject, CartItemInterface $item): array
+    {
+        /** @var Event $event */
+        $event = $this->observerFactory->create(Event::class, ['data' => ['item' => $item]]);
+        /** @var Observer $observer */
+        $observer = $this->observerFactory->create(Observer::class, ['data' => ['event' => $event]]);
+
+        $this->validator->validate($observer);
+
+        if (!empty($item->getMessage()) && $item->getHasError()) {
+            throw new LocalizedException(__($item->getMessage()));
+        }
+
+        return [$item];
+    }
+}
diff --git a/InventorySales/Plugin/Quote/Model/Quote/Item/CartItemPersister/ValidateQtyBeforePersist.php b/InventorySales/Plugin/Quote/Model/Quote/Item/CartItemPersister/ValidateQtyBeforePersist.php
new file mode 100644
index 000000000000..e4527a56aaad
--- /dev/null
+++ b/InventorySales/Plugin/Quote/Model/Quote/Item/CartItemPersister/ValidateQtyBeforePersist.php
@@ -0,0 +1,72 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\InventorySales\Plugin\Quote\Model\Quote\Item\CartItemPersister;
+
+use Magento\CatalogInventory\Model\Quote\Item\QuantityValidator;
+use Magento\Framework\Event;
+use Magento\Framework\Event\Observer;
+use Magento\Framework\Event\ObserverFactory;
+use Magento\Framework\Exception\LocalizedException;
+use Magento\Quote\Api\Data\CartInterface;
+use Magento\Quote\Api\Data\CartItemInterface;
+use Magento\Quote\Model\Quote\Item\CartItemPersister;
+
+/**
+ * Validate qty before persist.
+ */
+class ValidateQtyBeforePersist
+{
+    /**
+     * @var QuantityValidator
+     */
+    private $qtyValidator;
+    /**
+     * @var ObserverFactory
+     */
+    private $observerFactory;
+
+    /**
+     * @param QuantityValidator $validator
+     * @param ObserverFactory $observerFactory
+     */
+    public function __construct(QuantityValidator $validator, ObserverFactory $observerFactory)
+    {
+        $this->qtyValidator = $validator;
+        $this->observerFactory = $observerFactory;
+    }
+
+    /**
+     * Validate item qty before save.
+     *
+     * @param CartItemPersister $subject
+     * @param CartInterface $quote
+     * @param CartItemInterface $item
+     *
+     * @return array
+     * @throws LocalizedException
+     *
+     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
+     */
+    public function beforeSave(CartItemPersister $subject, CartInterface $quote, CartItemInterface $item): array
+    {
+        /** @var Event $event */
+        $event = $this->observerFactory->create(Event::class, ['data' => ['item' => $item]]);
+        /** @var Observer $observer */
+        $observer = $this->observerFactory->create(Observer::class, ['data' => ['event' => $event]]);
+
+        $this->qtyValidator->validate($observer);
+        if (!empty($item->getMessage()) && $item->getHasError()) {
+            throw new LocalizedException(__($item->getMessage()));
+        }
+
+        return [
+            $quote,
+            $item
+        ];
+    }
+}
diff --git a/InventorySales/composer.json b/InventorySales/composer.json
index e6a579643343..f401f79a71e7 100644
--- a/InventorySales/composer.json
+++ b/InventorySales/composer.json
@@ -19,7 +19,8 @@
         "magento/module-sales": "*"
     },
     "suggest": {
-        "magento/module-inventory-catalog": "*"
+        "magento/module-inventory-catalog": "*",
+        "magento/module-quote": "*"
     },
     "require-dev": {
         "magento/module-inventory-indexer": "*"
diff --git a/InventorySales/etc/di.xml b/InventorySales/etc/di.xml
index e98fa584ef90..b664f83a2817 100644
--- a/InventorySales/etc/di.xml
+++ b/InventorySales/etc/di.xml
@@ -189,4 +189,10 @@
     <preference for="Magento\InventorySalesApi\Api\Data\IsProductSalableForRequestedQtyRequestInterface" type="Magento\InventorySales\Model\IsProductSalableForRequestedQtyRequest"/>
     <preference for="Magento\InventorySalesApi\Api\Data\IsProductSalableForRequestedQtyResultInterface" type="Magento\InventorySales\Model\IsProductSalableForRequestedQtyResult"/>
     <preference for="Magento\InventorySalesApi\Api\Data\IsProductSalableResultInterface" type="Magento\InventorySales\Model\IsProductSalableResult"/>
+    <type name="Magento\Quote\Model\Quote\Item\CartItemPersister">
+        <plugin name="validate_qty_before_save_item" type="Magento\InventorySales\Plugin\Quote\Model\Quote\Item\CartItemPersister\ValidateQtyBeforePersist" />
+    </type>
+    <type name="Magento\Quote\Api\CartItemRepositoryInterface">
+        <plugin name="validate_qty_before_save_item" type="Magento\InventorySales\Plugin\Quote\Model\Quote\Item\CartItemPersister\ValidateQtyBeforePersist" />
+    </type>
 </config>
diff --git a/InventorySales/etc/events.xml b/InventorySales/etc/events.xml
index 63cfbdac4429..5d7a1bcbb668 100644
--- a/InventorySales/etc/events.xml
+++ b/InventorySales/etc/events.xml
@@ -23,4 +23,8 @@
     <event name="sales_model_service_quote_submit_before">
         <observer name="inventory" instance="Magento\CatalogInventory\Observer\SubtractQuoteInventoryObserver" disabled="true"/>
     </event>
+
+    <event name="sales_quote_item_qty_set_after">
+        <observer name="inventory" instance="Magento\CatalogInventory\Observer\QuantityValidatorObserver" disabled="true" />
+    </event>
 </config>