How to add an ad on the thread last post

[cvn]

Hello,

I want to add an ad to the lastest post of every thread in my forum, then I tried use add a "last_post_content" type.

But the ad appears on the last post of every page of all multi-page threads. That's not what I want. I want the ad to be on only the very last post of a thread.

Could you please tell me how I need to change the postbit template in order to obtain that result.

Thank you!