diff --git a/view/price_list_line_tree.xml b/view/price_list_line_tree.xml
index 017e43c818..e094bbd706 100644
--- a/view/price_list_line_tree.xml
+++ b/view/price_list_line_tree.xml
@@ -3,9 +3,9 @@
 this repository contains the full copyright notices and license terms. -->
 <tree>
     <field name="price_list" expand="1"/>
-    <field name="sequence"/>
+    <field name="sequence" optional="1"/>
     <field name="category" expand="1"/>
     <field name="product" expand="1"/>
     <field name="quantity"/>
-    <field name="formula" expand="1"/>
+    <field name="formula" expand="1" optional="0"/>
 </tree>
diff --git a/view/price_list_line_tree_sequence.xml b/view/price_list_line_tree_sequence.xml
index b10771f546..c656f2a0a7 100644
--- a/view/price_list_line_tree_sequence.xml
+++ b/view/price_list_line_tree_sequence.xml
@@ -2,8 +2,9 @@
 <!-- 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 sequence="sequence">
+    <field name="price_list" expand="1"/>
     <field name="category" expand="1"/>
     <field name="product" expand="1"/>
     <field name="quantity"/>
-    <field name="formula" expand="1"/>
+    <field name="formula" expand="1" optional="0"/>
 </tree>
diff --git a/view/price_list_tree.xml b/view/price_list_tree.xml
index f6de0e0d81..8858305a94 100644
--- a/view/price_list_tree.xml
+++ b/view/price_list_tree.xml
@@ -3,6 +3,6 @@
 this repository contains the full copyright notices and license terms. -->
 <tree>
     <field name="name" expand="1"/>
-    <field name="tax_included"/>
-    <field name="unit"/>
+    <field name="tax_included" optional="1"/>
+    <field name="unit" optional="1"/>
 </tree>