diff --git a/view/address_tree.xml b/view/address_tree.xml
index 178c05d8be..1d29a335b2 100644
--- a/view/address_tree.xml
+++ b/view/address_tree.xml
@@ -3,11 +3,11 @@
 this repository contains the full copyright notices and license terms. -->
 <tree>
     <field name="party" expand="1"/>
-    <field name="party_name"/>
-    <field name="name"/>
+    <field name="party_name" optional="0"/>
+    <field name="name" optional="0"/>
     <field name="street_single_line" expand="2"/>
     <field name="postal_code"/>
     <field name="city"/>
-    <field name="country"/>
-    <field name="subdivision"/>
+    <field name="country" optional="0"/>
+    <field name="subdivision" optional="0"/>
 </tree>
diff --git a/view/address_tree_sequence.xml b/view/address_tree_sequence.xml
index afa40e37b8..3b6d1fbef0 100644
--- a/view/address_tree_sequence.xml
+++ b/view/address_tree_sequence.xml
@@ -3,11 +3,11 @@
 this repository contains the full copyright notices and license terms. -->
 <tree sequence="sequence">
     <field name="party" expand="1"/>
-    <field name="party_name"/>
-    <field name="name"/>
+    <field name="party_name" optional="0"/>
+    <field name="name" optional="0"/>
     <field name="street_single_line" expand="2"/>
     <field name="postal_code"/>
     <field name="city"/>
-    <field name="country"/>
-    <field name="subdivision"/>
+    <field name="country" optional="0"/>
+    <field name="subdivision" optional="0"/>
 </tree>
diff --git a/view/category_tree.xml b/view/category_tree.xml
index e963d4392e..2777f1f9dc 100644
--- a/view/category_tree.xml
+++ b/view/category_tree.xml
@@ -3,6 +3,4 @@
 this repository contains the full copyright notices and license terms. -->
 <tree keyword_open="1">
     <field name="name" expand="1"/>
-    <field name="parent" tree_invisible="1"/>
-    <field name="childs" tree_invisible="1"/>
 </tree>
diff --git a/view/contact_mechanism_tree.xml b/view/contact_mechanism_tree.xml
index 8229fb2a38..da95baa667 100644
--- a/view/contact_mechanism_tree.xml
+++ b/view/contact_mechanism_tree.xml
@@ -4,7 +4,7 @@ this repository contains the full copyright notices and license terms. -->
 <tree>
     <field name="type"/>
     <field name="value" expand="1"/>
-    <field name="name" expand="1"/>
-    <field name="party" expand="2"/>
-    <field name="language" widget="selection"/>
+    <field name="name" expand="1" optional="0"/>
+    <field name="party" expand="2" optional="0"/>
+    <field name="language" widget="selection" optional="1"/>
 </tree>
diff --git a/view/contact_mechanism_tree_sequence.xml b/view/contact_mechanism_tree_sequence.xml
index 04b7bc6491..45b8d37280 100644
--- a/view/contact_mechanism_tree_sequence.xml
+++ b/view/contact_mechanism_tree_sequence.xml
@@ -4,8 +4,8 @@ this repository contains the full copyright notices and license terms. -->
 <tree sequence="sequence" editable="1">
     <field name="type"/>
     <field name="value" expand="1"/>
-    <field name="name" expand="1"/>
-    <field name="party" expand="2"/>
-    <field name="language" widget="selection"/>
+    <field name="name" expand="1" optional="0"/>
+    <field name="party" expand="2" optional="0"/>
+    <field name="language" widget="selection" optional="1"/>
     <field name="url" widget="url"/>
 </tree>
diff --git a/view/party_tree.xml b/view/party_tree.xml
index 2846d4f46e..5457a6572d 100644
--- a/view/party_tree.xml
+++ b/view/party_tree.xml
@@ -4,6 +4,6 @@ this repository contains the full copyright notices and license terms. -->
 <tree>
     <field name="code"/>
     <field name="name" expand="1"/>
-    <field name="lang"/>
-    <field name="tax_identifier"/>
+    <field name="lang" optional="1"/>
+    <field name="tax_identifier" optional="0"/>
 </tree>