diff --git a/view/asset_list.xml b/view/asset_list.xml
index e5c15bc..7837d85 100644
--- a/view/asset_list.xml
+++ b/view/asset_list.xml
@@ -4,12 +4,12 @@ The COPYRIGHT file at the top level of this repository contains the
 full copyright notices and license terms. -->
 <tree>
     <field name="name" expand="1"/>
-    <field name="change_day1"/>
-    <field name="change_month1"/>
-    <field name="change_month3"/>
-    <field name="change_month6"/>
-    <field name="date"/>
-    <field name="rate" symbol="asset_symbol"/>
-    <field name="isin"/>
-    <field name="wkn" />
+    <field name="change_day1" optional="0"/>
+    <field name="change_month1" optional="0"/>
+    <field name="change_month3" optional="0"/>
+    <field name="change_month6" optional="0"/>
+    <field name="date" optional="0"/>
+    <field name="rate" symbol="asset_symbol" optional="0"/>
+    <field name="isin" optional="0"/>
+    <field name="wkn" optional="0"/>
 </tree>