Django Form Wizard: Why is this happening?

I have a dinamic form wizard step as following:

class AltaForm6(forms.Form):  CHOICES = ((1, 1,), (2, 2,))    username = ChoiceFieldInvalid(required=True, label="Usuario", widget=forms.RadioSelect, choices=CHOICES)  username2 = forms.CharField(required=False, label="Otro")    def clean_username2(self):    username = self.cleaned_data.get('username')    username2 = self.cleaned_data.get('username2')      if username == "Otro" and len(username2) == 0:      raise forms.ValidationError("Debe especificar un nombre de usuario")    return username2    def clean_username(self):    username = self.cleaned_data.get('username')    return username

Then i dynamically change the choices values:

class AltaWizard(SessionWizardView):    template_name = 'agroshare/wizard.html'    def get_form(self, step=None, data=None, files=None):      form = super(AltaWizard, self).get_form(step, data, files)      if step == '5':           import logging         logger = logging.getLogger(__name__)           cleaned_data = self.get_cleaned_data_for_step('2') or {}         logger.error(cleaned_data)         nombre = cleaned_data.get('nombre')         apellido = cleaned_data.get('apellido')           first = possibleUid(nombre, apellido, '1')         second = possibleUid(nombre, apellido, '2')           if ' ' in nombre:            third = possibleUid(nombre, apellido, '3')            form.fields['username'].choices = ((first, first,), (second, second,), (third, third,), ("Otro", "Otro",))         if ' ' in apellido:            fourth = possibleUid(nombre, apellido, '4')            form.fields['username'].choices = ((first, first,), (second, second,), (fourth, fourth,), ("Otro", "Otro",))         else:            form.fields['username'].choices = ((first, first,), (second, second,), ("Otro", "Otro",))      if step == '5':         form.user = self.request.user      return form        def render(self, form=None, **kwargs):      form = form or self.get_form()      context = self.get_context_data(form=form, **kwargs)      if self.steps.current == '5':         form2 = self.get_form('5')         cleaned_data = self.get_cleaned_data_for_step('5') or {}         username = cleaned_data.get('username')         form2.fields['username'].choices = [username]      return self.render_to_response(context)

The problem is, when i go back to this step trough the wizard, it does not modify the "choices" values, it shows "CHOICES = ((1, 1,), (2, 2,))"

How can i achieve that when i go back to this step, the form can actually show the values i want?

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