diff --git a/src/Model/Shipment.php b/src/Model/Shipment.php
index 9b0987a..73aa56b 100644
--- a/src/Model/Shipment.php
+++ b/src/Model/Shipment.php
@@ -46,6 +46,13 @@ class Shipment
      */
     public $shippingProductId = 0;
 
+    /**
+     * 0 if Shipment, 1 if Retoure
+     * @var int
+     * @DataField(name="ShipmentType", type="int")
+     */
+    public $shipmentType = 0;
+
     /**
      * Creates a shipment based on models
      *