How to block the usage of a "Fix Version" if it has already been Released?

[Pedro G. Ferreira]

Is there any to configure the "Fix Version" field to not display the already Released versions?

[Roland Holban (Adaptavist)]

Here you go! Create a Fast-track transition listener and put this in the condition field:

// Gather changed field at the Issue Updated
def field = event.getChangeLog().getRelated('ChildChangeItem').find{it.field == "assignee"}

// Gather old field value
def old_field_value = field.oldstring

// Gather new field value
def new_field_value = field.newstring

old_field_value == null && new_field_value != null