It would make sense if Neto did not allow creation (auto or manual) of a 301 Redirect if the target URL and destination URL are the same.
This issue cropped up with our bulk product imports. If a product already exists and is imported with a URL (even if it is the same as the current URL) a circular 301 redirect is created.
This means as soon as any product is set to inactive, accessing that URL gives an error instead of a 404.