How to restrict a user from editing description but allow to change assignee

[Amit Raj]

I want everyone to see the description but not able to edit it once the task in In Progress. But they should be able to change the assignee. 

So I tried to set "jira.issue.editable" to "false" for the particular status. But it is not even allowing me to change the assignee.

Thanks

[Nic Brough -Adaptavist-]

The editable flag is for the whole issue, not just bits of it.  Setting that flag blocks all change to the issue fields.

The only way to stop edits of fields individually is to remove them from the "edit" screen, and put them on transition screens, as you can then protect the transitions with conditions.

Note that you can also use Behaviours to do block field editing, but it's a javascript trick to it can be bypassed, and doesn't work everywhere.