Unable to delete form/instance from inlineformset

Using Django 1.9.9, Python 2.7

I am trying to figure out why I am not able to delete form/instance inside of FormSet. I was folowing debug to this function in django.forms.formsets.py line 300.

def _should_delete_form(self, form):         """         Returns whether or not the form was marked for deletion.         """         return form.cleaned_data.get(DELETION_FIELD_NAME, False)

In my case:

form.cleaned_data = {'name': 2, 'file': FieldFile: real_estate_1/podpis.html}  data = { u'contracts-0-DELETE': [u'on'], ...}  changed_data = [[u'DELETE'], ...]

... The main problem is that cleaned_data missing the DELETE field. The formset has self.can_delete = True. But I am not able to figure out why the field is missing there...?

I would appreciate any advice.

My classes look this:

class DocumentsForm(CustomModelForm):      file = forms.FileField(label=_(u'Smlouva'), required=True)      empty_permitted = False    class Meta:      model = Contract      fields = ['name', 'file']      fields_with_permissions = ['file']      class RequestInlineFormSet(BaseGenericInlineFormSet):      formset = 'contracts'      empty_permitted = False        def __init__(self, *args, **kwargs):         self.request = kwargs.pop('request', None)         form_kwargs = {'request': self.request}         super(RequestInlineFormSet, self).__init__(form_kwargs=form_kwargs, *args, **kwargs)      ContractFormSet = generic_inlineformset_factory(Contract,                                              form=DocumentsForm,                                              formset=RequestInlineFormSet,                                              can_order=False,                                              can_delete=True,                                              fields=('name', 'file'),                                              extra=1)

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