How to prevent creating sub-tasks on closed parrent issue using script runner validation script

[Lotus Support]

I am trying to prevent users from cerating subtask on closed poarent issues..I am using ScriptRunner workflow function and onn validator i am using:

I tried this, and it just disables cretion  of subtaks regardless of status 

issue.parentObject.statusObject.name == "CLOSED"

If i use other option - it just lets me create subtasks regardless of status

issue.parentObject.statusObject.name != "CLOSED"

[Lotus Support]

sorry, but i get this error  

Mind that the word "zaključeno" is my word for closed

[Nic Brough -Adaptavist-]

Try

"CLOSED".equals(issue.parentObject.status().getName())

Also, are your status really that shouty?  The match from ==/equals is an exact match.