Issue #2890837 by czigor, loze: Order item type being ignored by the widget.

modules/order/src/Form/OrderForm.php

@@ -2,6 +2,7 @@
 
 namespace Drupal\commerce_order\Form;
 
+use Drupal\commerce_order\Entity\OrderItemType;
 use Drupal\Component\Datetime\TimeInterface;
 use Drupal\Core\Datetime\DateFormatterInterface;
 use Drupal\Core\Entity\ContentEntityForm;
@@ -60,6 +61,16 @@ class OrderForm extends ContentEntityForm {
     $order = $this->entity;
     $form = parent::form($form, $form_state);
 
+    // Narrow down order item types for the complex IEF widget.
+    if (isset($form['order_items']['widget']['actions'], $form['order_items']['widget']['actions']['bundle']) && !empty($form['order_items']['widget']['actions']['bundle']['#options'])) {
+      foreach ($form['order_items']['widget']['actions']['bundle']['#options'] as $order_item_type_id => $label) {
+        $order_item_type = OrderItemType::load($order_item_type_id);
+        if ($order_item_type->getOrderTypeId() !== $order->bundle()) {
+          unset($form['order_items']['widget']['actions']['bundle']['#options'][$order_item_type_id]);
+        }
+      }
+    }
+
     $form['#tree'] = TRUE;
     $form['#theme'] = 'commerce_order_edit_form';
     $form['#attached']['library'][] = 'commerce_order/form';