docs: def get_form(self, form_class=None):
          form = super(LineAlbaranUpdate, self).get_form(form_class)
  
          raise Exception("Cambiar ProductStock por ProductUnique")
          """
          ps = ProductStock.objects.filter(line_albaran=self.object).first()
          if ps:
              # initial field
              form.fields['storage'].initial = ps.batch.zone.storage
              form.fields['zone'].initial = ps.batch.zone
              form.fields['batch'].initial = ps.batch
          """
          return form