diff --git a/mail_activity_board/__manifest__.py b/mail_activity_board/__manifest__.py
index 87e1241..5e6d92b 100644
--- a/mail_activity_board/__manifest__.py
+++ b/mail_activity_board/__manifest__.py
@@ -8,7 +8,7 @@
     "development_status": "Beta",
     "category": "Social Network",
     "website": "https://github.com/OCA/social",
-    "author": "SDi, David Juaneda, Sodexis, Odoo Community Association (OCA)",
+    "author": "SDi, David Juaneda, Sodexis, ACSONE SA/NV, Odoo Community Association (OCA)",
     "license": "AGPL-3",
     "installable": True,
     "depends": ["calendar", "board"],
diff --git a/mail_activity_board/models/mail_activity.py b/mail_activity_board/models/mail_activity.py
index 8cfd77a..1862f67 100644
--- a/mail_activity_board/models/mail_activity.py
+++ b/mail_activity_board/models/mail_activity.py
@@ -17,6 +17,24 @@ class MailActivity(models.Model):
     calendar_event_id_partner_ids = fields.Many2many(
         related="calendar_event_id.partner_ids", readonly=True
     )
+    related_model_instance = fields.Reference(
+        selection="_selection_related_model_instance",
+        compute="_compute_related_model_instance",
+        string="Document",
+    )
+
+    @api.depends("res_id", "res_model")
+    def _compute_related_model_instance(self):
+        for record in self:
+            ref = False
+            if record.res_id:
+                ref = "{},{}".format(record.res_model, record.res_id)
+            record.related_model_instance = ref
+
+    @api.model
+    def _selection_related_model_instance(self):
+        models = self.env["ir.model"].search([("is_mail_activity", "=", True)])
+        return [(model.model, model.name) for model in models]
 
     def open_origin(self):
         self.ensure_one()
diff --git a/mail_activity_board/readme/CONTRIBUTORS.rst b/mail_activity_board/readme/CONTRIBUTORS.rst
index 5530d75..adad24f 100644
--- a/mail_activity_board/readme/CONTRIBUTORS.rst
+++ b/mail_activity_board/readme/CONTRIBUTORS.rst
@@ -9,3 +9,7 @@
 * `Pesol <https://www.pesol.es>`_:
 
   * Pedro Gonzalez (pedro.gonzalez@pesol.es)
+
+* `ACSONE SA/NV <https://www.acsone.eu>`_
+
+  * Laurent Mignon <laurent.mignon@acsone.eu>
diff --git a/mail_activity_board/tests/test_mail_activity_board.py b/mail_activity_board/tests/test_mail_activity_board.py
index 6aede0d..f83d971 100644
--- a/mail_activity_board/tests/test_mail_activity_board.py
+++ b/mail_activity_board/tests/test_mail_activity_board.py
@@ -202,3 +202,11 @@ class TestMailActivityBoardMethods(TransactionCase):
 
         for act in acts:
             self.assertIn(act, self.partner_client.activity_ids.ids)
+
+    def test_related_model_instance(self):
+        """This test case checks the direct access from the activity to the
+        linked model instance
+        """
+        self.assertEqual(self.act3.related_model_instance, self.partner_client)
+        self.act3.write({"res_id": False, "res_model": False})
+        self.assertFalse(self.act3.related_model_instance)
diff --git a/mail_activity_board/views/mail_activity_view.xml b/mail_activity_board/views/mail_activity_view.xml
index 2949532..9c3f365 100644
--- a/mail_activity_board/views/mail_activity_view.xml
+++ b/mail_activity_board/views/mail_activity_view.xml
@@ -4,6 +4,45 @@
     VIEWS
 -->
 
+    <!-- FORM POP
+
+        Add a link to the related model instance to ease navigation
+    -->
+    <record id="mail_activity_view_form_popup" model="ir.ui.view">
+        <field
+            name="name"
+        >mail.activity.view.form.popup (in mail_activity_board)</field>
+        <field name="model">mail.activity</field>
+        <field name="inherit_id" ref="mail.mail_activity_view_form_popup" />
+        <field name="arch" type="xml">
+            <field name="activity_type_id" position="before">
+                <field
+                    name="related_model_instance"
+                    attrs="{'invisible': [('related_model_instance','=', False)]}"
+                />
+            </field>
+        </field>
+    </record>
+
+    <!-- CALENDAR VIEW
+        Add a link to the related model instance to ease navigation
+    -->
+    <record id="mail_activity_view_calendar" model="ir.ui.view">
+        <field
+            name="name"
+        >mail.activity.view.form.calendar (in mail_activity_board)</field>
+        <field name="model">mail.activity</field>
+        <field name="inherit_id" ref="mail.mail_activity_view_calendar" />
+        <field name="arch" type="xml">
+            <field name="res_name" position="before">
+                <field name="related_model_instance" />
+            </field>
+            <field name="res_name" position="attributes">
+                <attribute name="invisible">1</attribute>
+            </field>
+        </field>
+    </record>
+
     <!-- FORM VIEW -->
     <record id="mail_activity_view_form_board" model="ir.ui.view">
         <field name="name">mail.activity.boards.view.form</field>
@@ -18,7 +57,8 @@
                         class="centre oe_link"
                         nolabel="1"
                     >
-                        <h1><field name="res_name" /></h1>
+                        <field name="res_name" invisible="1" />
+                        <h1><field name="related_model_instance" /></h1>
                     </button>
                     <field name="activity_category" invisible="1" />
                     <field name="res_model" invisible="1" />
@@ -88,7 +128,12 @@
                     name="decoration-success"
                 >(date_deadline &gt; current_date)</attribute>
             </xpath>
-
+            <field name="res_name" position="before">
+                <field name="related_model_instance" />
+            </field>
+            <field name="res_name" position="attributes">
+                <attribute name="invisible">1</attribute>
+            </field>
         </field>
     </record>