This request can not be used in parameter script, check it in the documentation please: “Expression returns 0 and contains dummy return values (emtpy string or 0) if used in parameter script, causing additional warning.”
Instead of this, you can use it in the ui script, and use the returned values in a custom popup infield, as it is written here: https://gdl.graphisoft.com/tips-and-tricks/display-properties-with-labels/
Gergely Fehér
Team Leader, Library Team
GRAPHISOFT SE