Merge pull request #308 from paynl/feature/PLUG-5017

Updated msi check

Author: woutse

Observer/SubtractInventoryObserver.php

@@ -82,7 +82,10 @@ public function execute(EventObserver $observer)
             $websiteCode = $website->getCode();
             $websiteId = $website->getId();
 
-            if (class_exists(\Magento\InventorySales\Model\ResourceModel\GetAssignedStockIdForWebsite::class) && class_exists(\Magento\InventoryReservationsApi\Model\ReservationBuilderInterface::class) && class_exists(\Magento\InventoryReservationsApi\Model\AppendReservationsInterface::class)) {
+            if (
+                interface_exists(\Magento\InventoryReservationsApi\Model\ReservationBuilderInterface::class)
+                && interface_exists(\Magento\InventoryReservationsApi\Model\AppendReservationsInterface::class)
+            ) {
                 $stockId = $this->getAssignedStockIdForWebsite->execute($websiteCode);
                 $reservations = [];