I would like to make a customfield hidden if a user is not in a certain group. For this I added a mapping to a project and issuetype in scriptrunner -> behaviours.
Now when selecting the behaviour for the field (I picked "Hidden") I get the message:
The field Testing is not hideable, so it will only be hidden when the issue is editable.More info.
The condition I am using is "Except" and I am testing for "Current user in group: XYZ"
The field itself is a multiline textfield (enabling or disabling the search index has no effect).
How can I find out why the field is not hideable? It is not marked as required or such.
JIRA-Version: v7.12.3