Finally it was a very silly error 😊 I did read a lot of documentation, problem was with select options.
This field has to be a list of dooble list, for example:
set priority_options { "1" "2" "2" } is bad but ...
set priority_options { {"1" "1"} {"2" "2"} {"3" "3"} } is good.
So, I had to put label AND value. Now, it works.