diff --git a/pending_call.py b/pending_call.py
index 655f9ed..74ce429 100644
--- a/pending_call.py
+++ b/pending_call.py
@@ -8,4 +8,4 @@ class PendingCall(ModelSQL, ModelView):
     __name__ = "sale.pending_call"
 
     date = fields.Date('Date', required=True)
-    prospect_trace = fields.Many2One('sale.prospect_trace', 'Prospect trace')
+    # prospect_trace = fields.Many2One('sale.prospect_trace', 'Prospect trace')
diff --git a/prospect_trace.py b/prospect_trace.py
index e03e528..f79fc71 100644
--- a/prospect_trace.py
+++ b/prospect_trace.py
@@ -18,8 +18,9 @@ class ProspectTrace(DeactivableMixin, ModelSQL, ModelView):
                                     states={'readonly': True})
 
     calls = fields.One2Many('sale.call', 'prospect_trace', 'Calls')
-    pending_calls = fields.One2Many(
-        'sale.pending_call', 'prospect_trace', 'Pending calls')
+    # pending_calls = fields.One2Many(
+    #     'sale.pending_call', 'prospect_trace', 'Pending calls')
+    pending_call = fields.Many2One('sale.pending_call', 'Pending call')
 
     current_interest = fields.Selection(
         Interest.get_interest_levels(), 'Current interest')
@@ -35,7 +36,8 @@ class ProspectTrace(DeactivableMixin, ModelSQL, ModelView):
     def default_state(cls):
         return 'open'
 
-    @fields.depends('calls', 'pending_calls', 'current_interest', 'state')
+    # 'pending_calls'
+    @fields.depends('calls', 'pending_call', 'current_interest', 'state')
     def on_change_calls(self):
         if not self.calls:
             return
@@ -51,14 +53,13 @@ class ProspectTrace(DeactivableMixin, ModelSQL, ModelView):
             first_call_type = CallTypes.get_call_types()[0][0]
             last_call.call_type = first_call_type
 
-        there_is_a_pending_call = len(self.pending_calls) >= 1
-        if there_is_a_pending_call:
-            self.pending_calls = None
+        if self.pending_call:
+            self.pending_call = None
             self.state = 'open'
 
-    @fields.depends('pending_calls', 'state')
-    def on_change_pending_calls(self):
-        if len(self.pending_calls) >= 1:
+    @fields.depends('pending_call', 'state')
+    def on_change_pending_call(self):
+        if self.pending_call:
             self.state = 'with_pending_calls'
 
     @fields.depends('prospect', 'prospect_city', 'prospect_contact')
diff --git a/tests/scenario_sale_opportunity_management.rst b/tests/scenario_sale_opportunity_management.rst
index f61ab94..2b87ba3 100644
--- a/tests/scenario_sale_opportunity_management.rst
+++ b/tests/scenario_sale_opportunity_management.rst
@@ -200,20 +200,21 @@ Verificar estado final del seguimiento del prospecto y sus llamadas
     'open'
 
 Programar una próxima llamada pendiente al seguimiento de prospecto::
-    >>> pending_call4 = prospect_trace.pending_calls.new(date = date.today() + timedelta(days=7))
-    >>> prospect_trace.save()
-
-    >>> prospect_trace.pending_calls
-    [proteus.Model.get('sale.pending_call')(1)]
+    >>> PendingCall = Model.get('sale.pending_call')
+    >>> pending_call = PendingCall()
+    >>> pending_call.date = date(year=2023, month=8, day=8)
+    >>> prospect_trace.pending_call = pending_call
 
+    >>> prospect_trace.pending_call.date
+    datetime.date(2023, 8, 8)
     >>> prospect_trace.state
     'with_pending_calls'
 
 Crear una llamada agendada previamente:
     >>> call4 = prospect_trace.calls.new(description='fourth call', interest='3')
 
-    >>> prospect_trace.pending_calls
-    []
+    >>> prospect_trace.pending_call
+
     >>> prospect_trace.state
     'open'
 
diff --git a/view/pending_call_form.xml b/view/pending_call_form.xml
index 707df4f..02f1678 100644
--- a/view/pending_call_form.xml
+++ b/view/pending_call_form.xml
@@ -5,6 +5,6 @@ this repository contains the full copyright notices and license terms. -->
     <label name="date"/>
     <field name="date"/>
 
-    <label name="prospect_trace"/>
-    <field name="prospect_trace"/>
+    <!-- <label name="prospect_trace"/>
+    <field name="prospect_trace"/> -->
 </form>
\ No newline at end of file
diff --git a/view/pending_call_tree.xml b/view/pending_call_tree.xml
index 45b4a30..ee3b9ba 100644
--- a/view/pending_call_tree.xml
+++ b/view/pending_call_tree.xml
@@ -3,5 +3,5 @@
 this repository contains the full copyright notices and license terms. -->
 <tree>
     <field name="date" expand="1"/>
-    <field name="prospect_trace" expand="1"/>
+    <!-- <field name="prospect_trace" expand="1"/> -->
 </tree>
\ No newline at end of file
diff --git a/view/prospect_trace_form.xml b/view/prospect_trace_form.xml
index a163b09..a374ff2 100644
--- a/view/prospect_trace_form.xml
+++ b/view/prospect_trace_form.xml
@@ -25,7 +25,7 @@ this repository contains the full copyright notices and license terms. -->
         </page>
     </notebook>
 
-    <field name="pending_calls" colspan="6"/>
+    <!-- <field name="pending_calls" colspan="6"/> -->
     <label name="state"/>
     <field name="state"/>
 </form>
\ No newline at end of file
diff --git a/view/prospect_trace_tree.xml b/view/prospect_trace_tree.xml
index b7565f2..aab6dcd 100644
--- a/view/prospect_trace_tree.xml
+++ b/view/prospect_trace_tree.xml
@@ -7,5 +7,5 @@ this repository contains the full copyright notices and license terms. -->
     <field name="prospect_city" expand="1"/>
     <field name="current_interest" expand="1"/>
     <field name="calls" expand="1"/>
-    <field name="pending_calls" expand="1"/>
+    <!-- <field name="pending_calls" expand="1"/> -->
 </tree>
\ No newline at end of file