diff --git a/purchase_request.py b/purchase_request.py
index 2929b58fcf..ef2aa42d2d 100644
--- a/purchase_request.py
+++ b/purchase_request.py
@@ -85,7 +85,7 @@ class PurchaseRequest(ModelSQL, ModelView):
             ('draft', "Draft"),
             ('cancel', "Cancel"),
             ('exception', "Exception"),
-            ], "State", required=True, select=True)
+            ], "State", required=True, readonly=True, select=True)
 
     @classmethod
     def __setup__(cls):