I have tried a few methods, but I'm unable to prevent the Fix Version/s field from being edited in about 4 statuses. I've created a Behaviour and tried the following conditions (at different times), but neither are preventing edits to the Fix Version/s field.
When : Workflow Step <status 1>
Workflow Step <status 2>
Workflow Step <status 3>
Workflow Step <status 4>
&
Except: Workflow Step <status 5>
Workflow Step <status 6>
Workflow Step <status 7>
Workflow Step <status 8>
Workflow Step <status 9>
Workflow Step <status 10>
The Behaviour is mapped to All Issue Types & a few projects. The workflow steps would also span multiple workflows.
I have another Behaviour preventing a custom field from being edited by project role, not status. I tried disabling that to see if they were conflicting with each other, but no luck.