QUESTION! I use WPFORO Plugin + blog cross posting addon.

I would like to know if anyone can advise me. I use WP forum Plugin and bought their special add-ons, but one of the addons Named "blog cross-posting" import all articles written on the webpage to the forum thread and only at the bottom of forum post there is a button "this article also written here".

My question: is it super bad to use this function? (articles and forum domain are on the same domain name. and belong to us.)

Worried about duplicate content and SEO.