Callback doesn't work, what's wrong?

[eluser]PhilTem[/eluser]
Because you need to check for a string provided as $value in the validation function. If you check for 0 it translates to "If $value is not set or empty"

Thus:

Code:

public function check_unesco($value = '0') {
if ($value == "0") {
     $this->form_validation->set_message('check_unesco_value', 'Debe seleccionar un Código UNESCO');
     return FALSE;
} else {
     return TRUE;
}