diff --git a/maintenance.py b/maintenance.py
index 54c7bde..d1c8070 100644
--- a/maintenance.py
+++ b/maintenance.py
@@ -302,7 +302,7 @@ class Maintenance(Workflow, ModelSQL, ModelView):
     def view_attributes(cls):
         return super(Maintenance, cls).view_attributes() + [
             ('//page[@id="preventive"]', 'states', {
-                'invisible': If(Eval('maintenance_type') != 'preventive', True),
+                'invisible': If(Eval('maintenance_type') == 'corrective', True),
             }),
             ('//page[@id="corrective"]', 'states',{
                 'invisible': If(Eval('maintenance_type') != 'corrective', True),
diff --git a/view/maintenance_service_tree.xml b/view/maintenance_service_tree.xml
index 31cff98..4ac657e 100644
--- a/view/maintenance_service_tree.xml
+++ b/view/maintenance_service_tree.xml
@@ -3,6 +3,7 @@
      this repository contains the full copyright notices and license terms.-->
 <tree>
     <field name="code"/>
+    <field name="maintenance_type"/>	
     <field name="propietary"/>
     <field name="propietary_address"/>
     <field name="sale_origin"/>