diff --git a/call.py b/call.py
index 59234f3..074c7d5 100644
--- a/call.py
+++ b/call.py
@@ -17,10 +17,11 @@ class Call(ModelSQL, ModelView):
 
     prospect_trace = fields.Many2One('sale.prospect_trace', 'Prospect trace')
 
-    interest = fields.Selection(Interest.get_interest_levels(), 'Interest')
+    interest = fields.Selection(
+        Interest.get_interest_levels(), 'Interest', required=True)
     call_type = fields.Selection(CallTypes.get_call_types(), 'Call type')
     call_result = fields.Selection(
-        CallResults.get_call_results(), 'Call result', required=False)
+        CallResults.get_call_results(), 'Call result')
 
     @classmethod
     def default_date(cls):
diff --git a/prospect_trace.py b/prospect_trace.py
index d351206..3e14c27 100644
--- a/prospect_trace.py
+++ b/prospect_trace.py
@@ -1,6 +1,8 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
 from trytond.model import ModelSQL, ModelView, fields
+
+from .selections.call_types import CallTypes
 from .selections.interest import Interest
 
 
@@ -23,7 +25,13 @@ class ProspectTrace(ModelSQL, ModelView):
     @fields.depends('calls', 'current_interest')
     def on_change_calls(self):
         if self.calls:
-            self.current_interest = self.calls[-1].interest
+            last_call = self.calls[-1]
+            self.current_interest = last_call.interest
+
+            if len(self.calls) > 1:
+                last_call.call_type = CallTypes.get_call_types()[1][0]
+            else:
+                last_call.call_type = CallTypes.get_call_types()[0][0]
 
     def get_rec_name(self, name):
         if self.prospect:
diff --git a/tests/scenario_sale_opportunity_management.rst b/tests/scenario_sale_opportunity_management.rst
index c6561f5..c051212 100644
--- a/tests/scenario_sale_opportunity_management.rst
+++ b/tests/scenario_sale_opportunity_management.rst
@@ -148,20 +148,23 @@ Crear seguimiento de prospecto::
     '31223425234'
 
 Crear llamadas a un seguimiento de prospecto desde el seguimiento de prospecto::
-    >>> call = prospect_trace.calls.new(description='First call', interest='0', call_type='first_call')
-    >>> call = prospect_trace.calls.new(description='Second call', interest='1', call_type='followup_call')
-    >>> call = prospect_trace.calls.new(description='Third call', interest='3', call_type='followup_call')
+    >>> call = prospect_trace.calls.new(description='First call', interest='0')
+    >>> call = prospect_trace.calls.new(description='Second call', interest='1')
+    >>> call = prospect_trace.calls.new(description='Third call', interest='3')
     >>> prospect_trace.save()
-    
 
 Verificar estado final del seguimiento del prospecto y sus llamadas
     >>> prospect_trace.calls[0].call_result
     'missed_call'
+    >>> prospect_trace.calls[0].call_type
+    'first_call'
     >>> prospect_trace.calls[0].date == date.today()
     True
 
     >>> prospect_trace.calls[1].call_result
     'answered_call'
+    >>> prospect_trace.calls[1].call_type
+    'followup_call'
     
     >>> prospect_trace.calls
     [proteus.Model.get('sale.call')(1), proteus.Model.get('sale.call')(2), proteus.Model.get('sale.call')(3)]