Multiple blog comments to 1 url

I have a list of auto approve urls that have my link posted on it 1 time. And I would like to re-use the list to comment with the same links 1 more time.

But when i try and re-post the same link, i get the message “link already present”.

I checked the option, Options > Scheduled Posting >  “allow posting on same site again

But still no luck, has anyone got any ideas on how to enable this please?