'Check if document links to any active document before Cancel.'

def check_no_back_links_exist(self):

    from frappe.model.delete_doc import check_if_doc_is_linked, check_if_doc_is_dynamically_linked
    if (not self.flags.ignore_links):
        check_if_doc_is_linked(self, method=u'Cancel')
        check_if_doc_is_dynamically_linked(self, method=u'Cancel')
