diff --git a/production.py b/production.py
index bd88fd6ac3..acd7a354e4 100644
--- a/production.py
+++ b/production.py
@@ -492,6 +492,12 @@ class Production(Workflow, ModelSQL, ModelView):
                     costs=self.cost,
                     outputs=cost_price))
 
+    @classmethod
+    def view_attributes(cls):
+        return [
+            ('/tree', 'visual', If(Eval('state') == 'cancel', 'muted', '')),
+            ]
+
     @classmethod
     def create(cls, vlist):
         Sequence = Pool().get('ir.sequence')