'Check that list_editable is a sequence of editable fields from
list_display without first element.'

def _check_list_editable(self, obj):

    if (not isinstance(obj.list_editable, (list, tuple))):
        return must_be('a    list    or    tuple', option='list_editable', obj=obj, id='admin.E120')
    else:
        return list(chain.from_iterable((self._check_list_editable_item(obj, obj.model, item, ('list_editable[%d]' % index)) for (index, item) in enumerate(obj.list_editable))))
