Is there a way to correct this type of trajectory error ?

Thanks

Do you mean the strange bend of the AI's path in the middle of the turn?
Is that with test patch or normal version?
If it is normal version then try latest patch, it has some changes to AI.

If that happens with test patch then you could post feedback in this thread:
https://www.lfs.net/forum/thread/102117-Test-Patch-D4-%28now-D48%29
(Maybe with more info: track config, if it happens with all cars etc)

Thank you for your response Gutholz,

Yes, I'm talking about the trange bend in the middle of the turn.
The issue predates patch D48 and is not resolved with it. I think this is the same thing Pasci is talking about in the patch thread. https://www.lfs.net/forum/post/2061711#post2061711

Scawen says this no longer appears in the development version so there's no point wasting time on it. So I was wondering if there was a way to fix this while waiting for the next update.

The AI is really better since patch D48. It's a shame that small trajectory imperfections like this lessen the effect of the AI improvement. It would be great to be able to correct them manually.