Post from accomplished to natural

Hi,

I've a question. Since long time in FM, a player can become from
accomplished to natural for his post for example.
It don't seems the same case in FM 18. Somethings have changed ?
How a player con become natural for his post when he's accomplished ?
Please help.

I didn't find the right solution from the Internet.

References:
sydrtfhdt.sigames.com/topic/429807-post-from-accomplished-to-natural/
2D Flat Animation

Thanks