diff --git a/mass_mailing_partner/views/mailing_contact_view.xml b/mass_mailing_partner/views/mailing_contact_view.xml
index 38804ae..91b42b9 100644
--- a/mass_mailing_partner/views/mailing_contact_view.xml
+++ b/mass_mailing_partner/views/mailing_contact_view.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8" ?>
 <!-- Copyright 2015 Pedro M. Baeza <pedro.baeza@tecnativa.com>
      Copyright 2015 Antonio Espinosa <antonio.espinosa@tecnativa.com>
      Copyright 2015 Javier Iniesta <javieria@antiun.com>
@@ -10,10 +10,13 @@
     <record model="ir.ui.view" id="view_mail_mass_mailing_contact_tree">
             <field name="name">mailing.contact.tree.inherit</field>
             <field name="model">mailing.contact</field>
-            <field name="inherit_id" ref="mass_mailing.view_mail_mass_mailing_contact_tree"/>
+            <field
+            name="inherit_id"
+            ref="mass_mailing.view_mail_mass_mailing_contact_tree"
+        />
             <field name="arch" type="xml">
                 <field name="email" position="after">
-                    <field name="partner_id"/>
+                    <field name="partner_id" />
                 </field>
             </field>
     </record>
@@ -21,28 +24,43 @@
     <record model="ir.ui.view" id="view_mail_mass_mailing_contact_form">
         <field name="name">mailing.contact.form.partner</field>
         <field name="model">mailing.contact</field>
-        <field name="inherit_id" ref="mass_mailing.view_mail_mass_mailing_contact_form"/>
+        <field
+            name="inherit_id"
+            ref="mass_mailing.view_mail_mass_mailing_contact_form"
+        />
         <field name="arch" type="xml">
             <xpath expr="//field[@name='email']/.." position="after">
-                <field name="partner_id"/>
+                <field name="partner_id" />
             </xpath>
             <field name="title_id" position="attributes">
-                <attribute name="attrs">{'readonly': [('partner_id', '!=', False)]}</attribute>
+                <attribute
+                    name="attrs"
+                >{'readonly': [('partner_id', '!=', False)]}</attribute>
             </field>
             <field name="email" position="attributes">
-                <attribute name="attrs">{'readonly': [('partner_id', '!=', False)]}</attribute>
+                <attribute
+                    name="attrs"
+                >{'readonly': [('partner_id', '!=', False)]}</attribute>
             </field>
             <field name="name" position="attributes">
-                <attribute name="attrs">{'readonly': [('partner_id', '!=', False)]}</attribute>
+                <attribute
+                    name="attrs"
+                >{'readonly': [('partner_id', '!=', False)]}</attribute>
             </field>
             <field name="company_name" position="attributes">
-                <attribute name="attrs">{'readonly': [('partner_id', '!=', False)]}</attribute>
+                <attribute
+                    name="attrs"
+                >{'readonly': [('partner_id', '!=', False)]}</attribute>
             </field>
             <field name="country_id" position="attributes">
-                <attribute name="attrs">{'readonly': [('partner_id', '!=', False)]}</attribute>
+                <attribute
+                    name="attrs"
+                >{'readonly': [('partner_id', '!=', False)]}</attribute>
             </field>
             <field name="tag_ids" position="attributes">
-                <attribute name="attrs">{'readonly': [('partner_id', '!=', False)]}</attribute>
+                <attribute
+                    name="attrs"
+                >{'readonly': [('partner_id', '!=', False)]}</attribute>
             </field>
         </field>
     </record>
@@ -50,15 +68,20 @@
     <record model="ir.ui.view" id="view_mail_mass_mailing_contact_search">
         <field name="name">Add partner search field and group by</field>
         <field name="model">mailing.contact</field>
-        <field name="inherit_id" ref="mass_mailing.view_mail_mass_mailing_contact_search"/>
+        <field
+            name="inherit_id"
+            ref="mass_mailing.view_mail_mass_mailing_contact_search"
+        />
         <field name="arch" type="xml">
             <field name="name" position="after">
-                <field name="partner_id"/>
+                <field name="partner_id" />
             </field>
             <filter name="group_create_date" position="after">
-                <filter string="Partner"
-                        name="group_partner"
-                        context="{'group_by': 'partner_id'}"/>
+                <filter
+                    string="Partner"
+                    name="group_partner"
+                    context="{'group_by': 'partner_id'}"
+                />
             </filter>
         </field>
     </record>
diff --git a/mass_mailing_partner/views/mailing_trace_view.xml b/mass_mailing_partner/views/mailing_trace_view.xml
index dfc3714..9d091bd 100644
--- a/mass_mailing_partner/views/mailing_trace_view.xml
+++ b/mass_mailing_partner/views/mailing_trace_view.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8" ?>
 <!-- Copyright 2016 Antonio Espinosa - <antonio.espinosa@tecnativa.com>
      Copyright 2020 Tecnativa - Manuel Calero
      License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html). -->
@@ -7,10 +7,10 @@
 <record model="ir.ui.view" id="mailing_trace_view_form">
     <field name="name">Add partner field</field>
     <field name="model">mailing.trace</field>
-    <field name="inherit_id" ref="mass_mailing.mailing_trace_view_form"/>
+    <field name="inherit_id" ref="mass_mailing.mailing_trace_view_form" />
     <field name="arch" type="xml">
         <field name="res_id" position="after">
-            <field name="partner_id"/>
+            <field name="partner_id" />
         </field>
     </field>
 </record>
@@ -18,10 +18,10 @@
 <record model="ir.ui.view" id="mailing_trace_view_tree">
     <field name="name">Add partner column</field>
     <field name="model">mailing.trace</field>
-    <field name="inherit_id" ref="mass_mailing.mailing_trace_view_tree"/>
+    <field name="inherit_id" ref="mass_mailing.mailing_trace_view_tree" />
     <field name="arch" type="xml">
         <field name="sent" position="before">
-            <field name="partner_id"/>
+            <field name="partner_id" />
         </field>
     </field>
 </record>
@@ -29,15 +29,17 @@
 <record model="ir.ui.view" id="mailing_trace_view_search">
     <field name="name">Add partner search field and group by</field>
     <field name="model">mailing.trace</field>
-    <field name="inherit_id" ref="mass_mailing.mailing_trace_view_search"/>
+    <field name="inherit_id" ref="mass_mailing.mailing_trace_view_search" />
     <field name="arch" type="xml">
         <field name="mass_mailing_id" position="after">
-            <field name="partner_id"/>
+            <field name="partner_id" />
         </field>
         <filter name="group_reply_date" position="after">
-            <filter string="Partner"
+            <filter
+                    string="Partner"
                     name="group_partner"
-                    context="{'group_by': 'partner_id'}"/>
+                    context="{'group_by': 'partner_id'}"
+                />
         </filter>
     </field>
 </record>
diff --git a/mass_mailing_partner/views/res_partner_view.xml b/mass_mailing_partner/views/res_partner_view.xml
index f8000d1..967f9e4 100644
--- a/mass_mailing_partner/views/res_partner_view.xml
+++ b/mass_mailing_partner/views/res_partner_view.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8" ?>
 <!-- Copyright 2015 Pedro M. Baeza <pedro.baeza@tecnativa.com>
      Copyright 2015-16 Antonio Espinosa <antonio.espinosa@tecnativa.com>
      Copyright 2015 Javier Iniesta <javieria@antiun.com>
@@ -10,29 +10,40 @@
     <record model="ir.ui.view" id="view_partner_form">
         <field name="name">Partner Form with mailing contacts</field>
         <field name="model">res.partner</field>
-        <field name="inherit_id" ref="base.view_partner_form"/>
-        <field name="groups_id" eval="[(4, ref('mass_mailing.group_mass_mailing_user'))]"/>
+        <field name="inherit_id" ref="base.view_partner_form" />
+        <field
+            name="groups_id"
+            eval="[(4, ref('mass_mailing.group_mass_mailing_user'))]"
+        />
         <field name="arch" type="xml">
             <div name="button_box" position="inside">
-                <button name="%(mass_mailing.action_view_mass_mailing_contacts)d"
-                        context="{'search_default_partner_id': active_id,
+                <button
+                    name="%(mass_mailing.action_view_mass_mailing_contacts)d"
+                    context="{'search_default_partner_id': active_id,
                                   'default_partner_id': active_id}"
-                        type="action"
-                        class="oe_stat_button oe_inline"
-                        icon="fa-envelope-o">
-                    <field name="mass_mailing_contacts_count"
-                           widget="statinfo"
-                           string="Mailing contacts"/>
+                    type="action"
+                    class="oe_stat_button oe_inline"
+                    icon="fa-envelope-o"
+                >
+                    <field
+                        name="mass_mailing_contacts_count"
+                        widget="statinfo"
+                        string="Mailing contacts"
+                    />
                 </button>
-                <button name="%(mass_mailing.mailing_trace_action)d"
-                        context="{'search_default_partner_id': active_id,
+                <button
+                    name="%(mass_mailing.mailing_trace_action)d"
+                    context="{'search_default_partner_id': active_id,
                                   'default_partner_id': active_id}"
-                        type="action"
-                        class="oe_stat_button oe_inline"
-                        icon="fa-envelope-o">
-                    <field name="mass_mailing_stats_count"
-                           widget="statinfo"
-                           string="Mass mailing stats"/>
+                    type="action"
+                    class="oe_stat_button oe_inline"
+                    icon="fa-envelope-o"
+                >
+                    <field
+                        name="mass_mailing_stats_count"
+                        widget="statinfo"
+                        string="Mass mailing stats"
+                    />
                 </button>
             </div>
         </field>
@@ -41,13 +52,19 @@
     <record id="view_res_partner_filter" model="ir.ui.view">
         <field name="name">Partner Search with mailing contacts</field>
         <field name="model">res.partner</field>
-        <field name="inherit_id" ref="base.view_res_partner_filter"/>
-        <field name="groups_id" eval="[(4, ref('mass_mailing.group_mass_mailing_user'))]"/>
+        <field name="inherit_id" ref="base.view_res_partner_filter" />
+        <field
+            name="groups_id"
+            eval="[(4, ref('mass_mailing.group_mass_mailing_user'))]"
+        />
         <field name="priority">20</field>
         <field name="arch" type="xml">
             <field name="category_id" position="after">
-                <field name="mass_mailing_contact_ids" string="Mailing List"
-                    filter_domain="[('mass_mailing_contact_ids.list_ids','ilike', self)]"/>
+                <field
+                    name="mass_mailing_contact_ids"
+                    string="Mailing List"
+                    filter_domain="[('mass_mailing_contact_ids.list_ids','ilike', self)]"
+                />
             </field>
         </field>
     </record>
diff --git a/mass_mailing_partner/wizard/partner_mail_list_wizard.xml b/mass_mailing_partner/wizard/partner_mail_list_wizard.xml
index 688610a..1b32363 100644
--- a/mass_mailing_partner/wizard/partner_mail_list_wizard.xml
+++ b/mass_mailing_partner/wizard/partner_mail_list_wizard.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8" ?>
 <!-- Copyright 2015 Pedro M. Baeza <pedro.baeza@tecnativa.com>
      Copyright 2015 Antonio Espinosa <antonio.espinosa@tecnativa.com>
      Copyright 2015 Javier Iniesta <javieria@antiun.com>
@@ -6,12 +6,14 @@
      License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html). -->
 <odoo>
 
-    <act_window id="action_partner_mail_list"
+    <act_window
+        id="action_partner_mail_list"
         name="Add to mailing list"
         res_model="partner.mail.list.wizard"
         binding_model="res.partner"
         target="new"
-        view_mode="form"/>
+        view_mode="form"
+    />
 
     <record model="ir.ui.view" id="partner_mail_list_wizard_form">
         <field name="name">partner.mail.list.form</field>
@@ -19,11 +21,15 @@
         <field name="arch" type="xml">
             <form string="Create contact mailing list">
                 <group>
-                    <field name="mail_list_id"/>
+                    <field name="mail_list_id" />
                 </group>
                 <footer>
-                    <button string="Add contacts to mailing list" name="add_to_mail_list"
-                        type="object" class="oe_highlight"/>
+                    <button
+                        string="Add contacts to mailing list"
+                        name="add_to_mail_list"
+                        type="object"
+                        class="oe_highlight"
+                    />
                     <button string="Cancel" class="oe_link" special="cancel" />
                 </footer>
             </form>