diff --git a/view/opportunity_employee_monthly_tree.xml b/view/opportunity_employee_monthly_tree.xml
index 80298765c2..3847209894 100644
--- a/view/opportunity_employee_monthly_tree.xml
+++ b/view/opportunity_employee_monthly_tree.xml
@@ -5,23 +5,23 @@ this repository contains the full copyright notices and license terms. -->
     <field name="year" grouping="0"/>
     <field name="month" widget="selection"/>
     <field name="employee" expand="1"/>
-    <field name="number"/>
-    <field name="converted"/>
-    <field name="won"/>
-    <field name="lost"/>
-    <field name="conversion_rate" factor="100">
+    <field name="number" optional="1"/>
+    <field name="converted" optional="1"/>
+    <field name="won" optional="0"/>
+    <field name="lost" optional="1"/>
+    <field name="conversion_rate" factor="100" optional="1">
         <suffix string="%" name="conversion_rate"/>
     </field>
-    <field name="winning_rate" factor="100">
+    <field name="winning_rate" factor="100" optional="0">
         <suffix string="%" name="winning_rate"/>
     </field>
-    <field name="amount"/>
-    <field name="converted_amount"/>
-    <field name="won_amount"/>
-    <field name="conversion_amount_rate" factor="100">
+    <field name="amount" optional="1"/>
+    <field name="converted_amount" optional="1"/>
+    <field name="won_amount" optional="0"/>
+    <field name="conversion_amount_rate" factor="100" optional="1">
         <suffix string="%" name="conversion_amount_rate"/>
     </field>
-    <field name="winning_amount_rate" factor="100">
+    <field name="winning_amount_rate" factor="100" optional="0">
         <suffix string="%" name="winning_amount_rate"/>
     </field>
 </tree>
diff --git a/view/opportunity_employee_tree.xml b/view/opportunity_employee_tree.xml
index 769b4078c2..224a775020 100644
--- a/view/opportunity_employee_tree.xml
+++ b/view/opportunity_employee_tree.xml
@@ -3,23 +3,23 @@
 this repository contains the full copyright notices and license terms. -->
 <tree>
     <field name="employee" expand="1"/>
-    <field name="number"/>
-    <field name="converted"/>
-    <field name="won"/>
-    <field name="lost"/>
-    <field name="conversion_rate" factor="100">
+    <field name="number" optional="1"/>
+    <field name="converted" optional="1"/>
+    <field name="won" optional="0"/>
+    <field name="lost" optional="1"/>
+    <field name="conversion_rate" factor="100" optional="1">
         <suffix string="%" name="conversion_rate"/>
     </field>
-    <field name="winning_rate" factor="100">
+    <field name="winning_rate" factor="100" optional="0">
         <suffix string="%" name="winning_rate"/>
     </field>
-    <field name="amount"/>
-    <field name="converted_amount"/>
-    <field name="won_amount"/>
-    <field name="conversion_amount_rate" factor="100">
+    <field name="amount" optional="1"/>
+    <field name="converted_amount" optional="1"/>
+    <field name="won_amount" optional="0"/>
+    <field name="conversion_amount_rate" factor="100" optional="1">
         <suffix string="%" name="conversion_amount_rate"/>
     </field>
-    <field name="winning_amount_rate" factor="100">
+    <field name="winning_amount_rate" factor="100" optional="0">
         <suffix string="%" name="winning_amount_rate"/>
     </field>
 </tree>
diff --git a/view/opportunity_monthly_tree.xml b/view/opportunity_monthly_tree.xml
index 8fca6b6b2e..d7b8c3379c 100644
--- a/view/opportunity_monthly_tree.xml
+++ b/view/opportunity_monthly_tree.xml
@@ -4,24 +4,23 @@ this repository contains the full copyright notices and license terms. -->
 <tree>
     <field name="year" grouping="0"/>
     <field name="month" widget="selection"/>
-    <field name="number"/>
-    <field name="converted"/>
-    <field name="won"/>
-    <field name="lost"/>
-    <field name="conversion_rate" factor="100">
+    <field name="number" optional="1"/>
+    <field name="converted" optional="1"/>
+    <field name="won" optional="0"/>
+    <field name="lost" optional="1"/>
+    <field name="conversion_rate" factor="100" optional="1">
         <suffix string="%" name="conversion_rate"/>
     </field>
-    <field name="winning_rate" factor="100">
+    <field name="winning_rate" factor="100" optional="0">
         <suffix string="%" name="winning_rate"/>
     </field>
-    <field name="amount"/>
-    <field name="converted_amount"/>
-    <field name="won_amount"/>
-    <field name="currency"/>
-    <field name="conversion_amount_rate" factor="100">
+    <field name="amount" optional="1"/>
+    <field name="converted_amount" optional="1"/>
+    <field name="won_amount" optional="0"/>
+    <field name="conversion_amount_rate" factor="100" optional="1">
         <suffix string="%" name="conversion_amount_rate"/>
     </field>
-    <field name="winning_amount_rate" factor="100">
+    <field name="winning_amount_rate" factor="100" optional="0">
         <suffix string="%" name="winning_amount_rate"/>
     </field>
 </tree>
diff --git a/view/opportunity_tree.xml b/view/opportunity_tree.xml
index ed14addae7..2e1d0459bb 100644
--- a/view/opportunity_tree.xml
+++ b/view/opportunity_tree.xml
@@ -2,16 +2,17 @@
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
 <tree>
+    <field name="company" expand="1" optional="1"/>
     <field name="number" expand="1"/>
-    <field name="reference" expand="1"/>
-    <field name="start_date"/>
-    <field name="end_date"/>
-    <field name="employee" expand="1"/>
-    <field name="description" expand="1"/>
-    <field name="party" expand="1"/>
-    <field name="amount"/>
+    <field name="reference" expand="1" optional="1"/>
+    <field name="start_date" optional="0"/>
+    <field name="end_date" optional="0"/>
+    <field name="employee" expand="1" optional="0"/>
+    <field name="description" expand="1" optional="1"/>
+    <field name="party" expand="1" optional="0"/>
+    <field name="amount" optional="0"/>
     <field name="state"/>
-    <field name="conversion_probability" factor="100">
+    <field name="conversion_probability" factor="100" optional="0">
         <suffix name="conversion_probability" string="%"/>
     </field>
 </tree>