diff --git a/base_usability/partner_view.xml b/base_usability/partner_view.xml
index d5417d6..fd0d0d4 100644
--- a/base_usability/partner_view.xml
+++ b/base_usability/partner_view.xml
@@ -16,6 +16,10 @@
         <xpath expr="//field[@name='child_ids']/form//field[@name='function']" position="before">
             <field name="title"/>
         </xpath>
+        <!-- is_company option is readonly when the partner is a contact -->
+        <xpath expr="//div[@class='oe_edit_only']/field[@name='is_company']" position="attributes">
+            <attribute name="attrs">{'readonly': [('parent_id', '!=', False)]}</attribute>
+        </xpath>
     </field>
 </record>
 
@@ -27,6 +31,9 @@
         <field name="function" position="before">
             <field name="title"/>
         </field>
+        <xpath expr="//div[@class='oe_edit_only']/field[@name='is_company']" position="attributes">
+            <attribute name="attrs">{'readonly': [('parent_id', '!=', False)]}</attribute>
+        </xpath>
     </field>
 </record>