OK Thank you James.
I have got some tips to use another hook : acf/update_field/
For anyone interested, the answer is updated at
http://stackoverflow.com/questions/37717888/acfs-how-to-change-default-values-settings
It is not perfect, but it will work for me.
Greetz
James, as Pierre told me :
“An important point : this snippets will do the job for the display (of the value for the front, and on the field for the back), but they will not check/select the correct option on the ACF fields settings form.”
Do you think another way of approaching it is possible ?
… i think it would be a great feature to add, thou… great to match anyone’s method.
Thank you James,
Here is a very interesting answer i just got from Stackoverflow:
http://stackoverflow.com/questions/37717888/acfs-how-to-change-default-values-settings
Greetz!
Excellent !
Thank you John !
Best regards from Europe/Belgium…
Johan