diff --git a/views/contract_wizard.xml b/views/contract_wizard.xml
index 587d63d..64372b5 100644
--- a/views/contract_wizard.xml
+++ b/views/contract_wizard.xml
@@ -58,7 +58,7 @@
                     </group>
                     <group string="Contract values" colspan="4">
                         <field name="transient_field_ids">
-                            <tree editable="1">
+                            <tree editable="1" create="0" delete="0">
                                 <field name="name"/>
                                 <field name="value"/>
                                 <field name="description"/>