_set.all in a template with no results

Hi there,  I am trying to list in a template a bunch of fields  of the  model (PagosDetail) that is related to another one (PagosHead) via numero_pago field.

I am able to list the PagosHead items  in the template but when I use the " _set.all" in order to get those fields from PagosDetail i've no luck. 

Hope you can help me guys!

Models

class PagosHead(models.Model):

    numero_pago = models.IntegerField()

    numero_socio = models.ForeignKey(Socios, on_delete=models.CASCADE)

    fecha_pago = models.DateField(default=datetime.now,null=True,blank=True)

    importe_pago_total = models.DecimalField(default=0.00,max_digits=9,decimal_places=2)

    observaciones_pago = models.CharField(max_length=100,null=True)

class PagosDetail(models.Model):

    pago=models.ForeignKey(PagosHead,on_delete=models.CASCADE)

    importe_pago = models.DecimalField(default=0.00,max_digits=9,decimal_places=2)

    mes_pago = models.CharField(max_length=10)

    ano_pago = models.SmallIntegerField(null=True)

View

#Vista de Cuenta Corriente

@method_decorator(staff_member_required, name='dispatch')

class detalleCC(TemplateView):

    template_name = "pagos/cuenta_corriente.html"  

    contexto={}

    print("En detalleCC view")

    def get_context_data(self, **kwargs):

        contexto = super(detalleCC, self).get_context_data(**kwargs)

        contexto={

                'pagos': PagosHead.objects.filter(numero_socio_id=self.kwargs['pk']),

            }

        return contexto

Template

                                              {% for pago in pagos reversed %}

                                                  <tr>

                                                      <td style="font-size:90%;">{{pago.numero_pago}}</td>

                                                      <td style="font-size:90%;">{{pago.fecha_pago}}</td>    

                                                      <td style="font-size:90%;">{{pago.importe_pago_total}}</td>

                                                      <td style="font-size:90%;">{{pago.observaciones_pago}}</td>

                                                      <td><a class="btn btn-secondary btn-sm" href="{% url 'pagos:pdf' pk=pago.numero_pago %}" role="button" data-toggle="tooltip" data-placement="top" title="Imprimir"><i class="fa fa-print"></i></a></td>

                                                  </tr>

                                                  {% for pagosdet in pagos.pagosdetail_set.all %}

                                                    <tr>

                                                        <td style="font-size:90%;">{{pagosdet.mes_pago}}</td>

                                                    </tr>

                                                  {% endfor %}

                                              {% endfor %}

                                            </tbody>

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