Can not see table headers - ver 0.12

[devexchage@…]

I have installed plugin for 0.12 version. I have added the following configuration:

[ticket-custom] parent = text
parent.format = wiki
parent.label = Parent ID
[childtickets]
parent.bug.allow_child_tickets = true
parent.bug.default_child_type = bug
parent.bug.inherit_milestone = false
parent.bug.table_headers = type, priority, owner, summary, milestone

I have ticket type - bug. When I am adding ticket I can fill in Parent ID field with corresponding value. The problem is that I can not see header table in the parent ticket.