List edit acl on related list dependant on task.state

[Mike62]

I am trying to stop all editing of a related list when an incident is closed or cancelled. The related list is 'related services' which appears on Incident and I want to make the list view of related services read only when incident is in one of two states. I cant get this to work and it seems to ignore what task.state is. Any help is appreciated

[Mike62 · Accepted solution]

Thanks for everyone's input. The answer was to manually script it:

if(current.task.sys_class_name == 'incident'){

   if(current.task.state == 7 || current.task.state == 8){

       answer = false;