Before all, thank you for AceSef, it's working great.

However, I've a little problem concerning urls.
Because I have some article with same title in same category that SEF urls are the same.
That is why, I would like to add the article item ID at the end of url.

I have tried ti swith to on "add item id", "add content id" , "use smart id".

Do you have an answer to give me ?

Thank you very much.

You're welcome.

Go to AceSEF=>Extensions=>FLEXIcontent and set to Yes the "Add item ID" option then purge URLs, it'll be enough.