diff --git a/prospect.py b/prospect.py
index 33dbd4c..9be2056 100644
--- a/prospect.py
+++ b/prospect.py
@@ -36,6 +36,38 @@ class Prospect(ModelSQL, ModelView):
         ('unassigned', 'Unsassigned'),
         ('assigned', 'Assigned')], "State", readonly=True)
 
+    prospect_trace = fields.Many2One('sale.prospect_trace', 'Prospect trace')
+
+    @classmethod
+    def __setup__(cls):
+        super(Prospect, cls).__setup__()
+        cls._buttons.update({
+            'start_trace': {
+                'invisible': Eval('state') == 'unassigned'
+            }
+        })
+
+    @classmethod
+    @ModelView.button
+    def start_trace(cls, prospects):
+        pool = Pool()
+        ProspectTrace = pool.get('sale.prospect_trace')
+        for prospect in prospects:
+            if prospect.prospect_trace:
+                return
+
+            prospect_trace = ProspectTrace(
+                prospect=prospect,
+                prospect_city=prospect.city,
+                prospect_business_unit=prospect.business_unit,
+                prospect_assigned_operator=prospect.assigned_operator,
+                prospect_contacts=prospect.contact_methods
+            )
+            prospect_trace.save()
+
+            prospect.prospect_trace = prospect_trace
+            prospect.save()
+
     @classmethod
     def default_state(cls):
         return 'unassigned'
diff --git a/prospect.xml b/prospect.xml
index aa923ff..f5ec215 100644
--- a/prospect.xml
+++ b/prospect.xml
@@ -142,5 +142,11 @@ this repository contains the full copyright notices and license terms. -->
                 sequence="40"
                 id="menu_prospects_assigned_wizard"
                 action="assign_operator_wizard"/>
+
+        <record model="ir.model.button" id="start_trace_button">
+            <field name="name">start_trace</field>
+            <field name="string">Start trace</field>
+            <field name="model" search="[('model', '=', 'sale.prospect')]"/>
+        </record>
    </data>
 </tryton>
diff --git a/prospect_trace.py b/prospect_trace.py
index fa96252..19b61b3 100644
--- a/prospect_trace.py
+++ b/prospect_trace.py
@@ -15,7 +15,8 @@ class ProspectTrace(DeactivableMixin, ModelSQL, ModelView):
 
     _states = {'readonly': True}
 
-    prospect = fields.Many2One('sale.prospect', 'Prospect', required=True)
+    prospect = fields.Many2One(
+        'sale.prospect', 'Prospect', required=True, states=_states)
     prospect_business_unit = fields.Selection(
         [('brigade', 'Brigade'),
          ('optics', 'Optics'),
diff --git a/tests/scenario_sale_opportunity_management.rst b/tests/scenario_sale_opportunity_management.rst
index c6ef3a7..63b59b0 100644
--- a/tests/scenario_sale_opportunity_management.rst
+++ b/tests/scenario_sale_opportunity_management.rst
@@ -179,8 +179,9 @@ Seguimiento de prospecto 2
 
 Crear seguimiento de prospecto::
     >>> ProspectTrace = Model.get('sale.prospect_trace')
-    >>> prospect_trace = ProspectTrace()
+    >>> prospect1.click('start_trace')
 
+    >>> prospect_trace = ProspectTrace()
     >>> prospect_trace.prospect = prospect1
     >>> prospect_trace.save()
 
diff --git a/view/pending_call_form.xml b/view/pending_call_form.xml
deleted file mode 100644
index b7309c7..0000000
--- a/view/pending_call_form.xml
+++ /dev/null
@@ -1,8 +0,0 @@
-<?xml version="1.0"?>
-<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
-this repository contains the full copyright notices and license terms. -->
-<form>
-    <label name="date"/>
-    <field name="date" widget='date'/>
-    <field name="date" widget='time'/>
-</form>
\ No newline at end of file
diff --git a/view/pending_call_tree.xml b/view/pending_call_tree.xml
deleted file mode 100644
index a280396..0000000
--- a/view/pending_call_tree.xml
+++ /dev/null
@@ -1,7 +0,0 @@
-<?xml version="1.0"?>
-<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
-this repository contains the full copyright notices and license terms. -->
-<tree>
-    <field name="date" widget='date' expand="1"/>
-    <field name="date" widget='time' expand="1"/>
-</tree>
\ No newline at end of file
diff --git a/view/prospect_tree.xml b/view/prospect_tree.xml
index 0b9929a..bd36f14 100644
--- a/view/prospect_tree.xml
+++ b/view/prospect_tree.xml
@@ -7,5 +7,5 @@ this repository contains the full copyright notices and license terms. -->
     <field name="department" expand="1"/>
     <field name="city" expand="1"/>
     <field name="assigned_operator" expand="1"/>
-    <field name="contact_methods" expand="1"/>
+    <button name="start_trace"/>
 </tree>
\ No newline at end of file