title: Appflow Update_flow error : Destination object for the destination connector can not be updated
body: <p>Anyone faced this error while calling update_flow for appflow?</p>
  <p>errorMessage&quot;: &quot;An error occurred (ValidationException) when calling the UpdateFlow operation: Update Flow request failed due to:[Destination object for the destination connector can not be updated]&quot;,
  &quot;errorType&quot;: &quot;ValidationException&quot;,
  &quot;stackTrace&quot;: [
  &quot;  File &quot;/var/task/lambda_function.py&quot;, line 7, in lambda_handler\n    response = client.update_flow (\n&quot;,
  &quot;  File &quot;/var/runtime/botocore/client.py&quot;, line 357, in _api_call\n    return self._make_api_call(operation_name, kwargs)\n&quot;,
  &quot;  File &quot;/var/runtime/botocore/client.py&quot;, line 676, in _make_api_call\n    raise error_class(parsed_response, operation_name)\n&quot;</p>
  <p>What could be the cause.</p>