diff --git a/setra_client/models.py b/setra_client/models.py
index 0c81e0b92c86d6ee9f36fc4dfdcee22abe18e5f6..adc4db8140cae89cc36972e4f9ee50b56155aeaa 100644
--- a/setra_client/models.py
+++ b/setra_client/models.py
@@ -273,6 +273,7 @@ class Order(BaseModel):
     header_text: Optional[str]
     footer_text: Optional[str]
     details: Optional[List[Detail]]
+    ubw_final_number: Optional[str]
 
 
 class AbwOrder(BaseModel):
diff --git a/tests/fixtures/order_list_fixture.json b/tests/fixtures/order_list_fixture.json
index f24eb229185d068fd8cf57f3d673211f5c389359..2ba13b029971262945c4500a02ee011e43fdb040 100644
--- a/tests/fixtures/order_list_fixture.json
+++ b/tests/fixtures/order_list_fixture.json
@@ -17,6 +17,7 @@
         "text4": "txt4",
         "header_text": "headertext",
         "footer_text": "footertext",
+        "ubw_final_number": "123",
         "details": []
     },
     {
@@ -57,6 +58,7 @@
         "text4": "txt4",
         "header_text": "headertext",
         "footer_text": "footertext",
+        "ubw_final_number": "125",
         "details": []
     },
     {
@@ -77,6 +79,7 @@
         "text4": "txt444",
         "header_text": "headertext",
         "footer_text": "footertext",
+        "ubw_final_number": null,
         "details": []
     }
 ]