diff --git a/odex25_sales/odex25_website_event_track_gantt/views/event_sponsor_views.xml b/odex25_sales/odex25_website_event_track_gantt/views/event_sponsor_views.xml
index 579cf838b..177df469b 100644
--- a/odex25_sales/odex25_website_event_track_gantt/views/event_sponsor_views.xml
+++ b/odex25_sales/odex25_website_event_track_gantt/views/event_sponsor_views.xml
@@ -12,7 +12,19 @@
                 <attribute name="domain">[('is_sponsor','=',True)]</attribute>
             </xpath>
             <xpath expr="//field[@name='partner_id']" position="after">
-                <field name="contact_person"/>
+                <field name="contact_person" readonly="1"/>
+            </xpath>
+            <xpath expr="//field[@name='email']" position="attributes">
+                <attribute name="readonly">1</attribute>
+            </xpath>
+            <xpath expr="//field[@name='url']" position="attributes">
+                <attribute name="readonly">1</attribute>
+            </xpath>
+            <xpath expr="//field[@name='phone']" position="attributes">
+                <attribute name="readonly">1</attribute>
+            </xpath>
+            <xpath expr="//field[@name='mobile']" position="attributes">
+                <attribute name="readonly">1</attribute>
             </xpath>
         </field>
     </record>
diff --git a/odex25_sales/odex25_website_event_track_gantt/views/res_partner_views.xml b/odex25_sales/odex25_website_event_track_gantt/views/res_partner_views.xml
index df6a81143..28a1d5fa9 100644
--- a/odex25_sales/odex25_website_event_track_gantt/views/res_partner_views.xml
+++ b/odex25_sales/odex25_website_event_track_gantt/views/res_partner_views.xml
@@ -23,7 +23,7 @@
                 <attribute name="attrs">{'required': [('is_sponsor', '=', True)]}</attribute>
             </xpath>
             <field name="title" position="after">
-                <field name="contact_person"/>
+                <field name="contact_person" attrs="{'invisible': [('is_sponsor', '=', False)]}"/>
             </field>
         </field>
     </record>