Hi Baptiste,
Yes, you can use the acf/load_field filter to modify the field object. The code would look something like this:
function my_load_field($field) {
if(...) {
$field['readonly'] = 1;
}
return $field;
}
add_filter("acf/load_field", "my_load_field");
For more info, check out the documentation of the filter. Here is the link: http://www.advancedcustomfields.com/resources/acfload_field/
