diff --git a/app/code/Magento/InventoryCatalog/Plugin/Model/LegacyCatalogInventoryPlugin.php b/app/code/Magento/InventoryCatalog/Plugin/Model/LegacyCatalogInventoryPlugin.php
new file mode 100644
index 0000000000000..d6cdc646642a9
--- /dev/null
+++ b/app/code/Magento/InventoryCatalog/Plugin/Model/LegacyCatalogInventoryPlugin.php
@@ -0,0 +1,74 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: roettigl
+ * Date: 29.10.17
+ * Time: 15:24
+ */
+
+namespace Magento\InventoryCatalog\Plugin\Model;
+
+use Magento\Framework\App\ResourceConnection;
+use Magento\InventoryApi\Api\Data\ReservationInterface;
+use Magento\InventoryApi\Api\ReservationsAppendInterface;
+
+/**
+ * Plugin help to fill the legacy catalog inventory tables cataloginventory_stock_status and
+ * cataloginventory_stock_item to don't break the backward compatible.
+ */
+class LegacyCatalogInventoryPlugin
+{
+
+    /**
+     * @var ResourceConnection
+     */
+    private $resourceConnection;
+
+    /**
+     * @param ResourceConnection $resourceConnection
+     */
+    public function __construct(ResourceConnection $resourceConnection)
+    {
+        $this->resourceConnection = $resourceConnection;
+    }
+
+    /**
+     * Plugin method to fill the legacy tables.
+     *
+     * @param ReservationsAppendInterface $subject
+     * @param callable $callable
+     * @param ReservationInterface[] $reservations
+     * @return mixed
+     * @see ReservationsAppendInterface::execute
+     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
+     */
+    public function aroundExecute(ReservationsAppendInterface $subject, callable $callable, array $reservations)
+    {
+        $result = $callable($reservations);
+        $this->updateStockItemTable($reservations);
+        $this->updateStockStatusTable($reservations);
+        return $result;
+    }
+
+    /**
+     * Update cataloginventory_stock_item qty with reservation information.
+     *
+     * @param ReservationInterface[] $reservations
+     * @return void
+     */
+    private function updateStockItemTable(array $reservations)
+    {
+        // @todo impelemention reqiured
+    }
+
+    /**
+     * Update cataloginventory_stock_status qty with reservation information.
+     *
+     * @param ReservationInterface[] $reservations
+     * @return void
+     */
+    private function updateStockStatusTable(array $reservations)
+    {
+        // @todo impelemention reqiured
+    }
+}
diff --git a/app/code/Magento/InventoryCatalog/etc/di.xml b/app/code/Magento/InventoryCatalog/etc/di.xml
index 997bbe26b3c4a..9175dc65ec298 100644
--- a/app/code/Magento/InventoryCatalog/etc/di.xml
+++ b/app/code/Magento/InventoryCatalog/etc/di.xml
@@ -11,4 +11,7 @@
     <type name="Magento\InventoryApi\Api\StockRepositoryInterface">
         <plugin name="prevent_default_stock_deletion" type="Magento\InventoryCatalog\Plugin\Model\StockRepositoryPlugin" sortOrder="1"/>
     </type>
+    <type name="Magento\InventoryApi\Api\ReservationsAppendInterface">
+        <plugin name="legacy_catalog_inventory_plugin" type="Magento\InventoryCatalog\Plugin\Model\LegacyCatalogInventoryPlugin" sortOrder="1"/>
+    </type>
 </config>