[xwiki-users] XEM 4.0.3: Bulletin Board doesn't work properly

Hi all, I installed XEM 4.0.3 from scratch, created wiki and install Bulletin Board application I have used with XEM 2.3 in the past. I discovered small but troublesome bug: If a new topic is created, after Save and view button is pressed, the created page lost information about its parent page, so it's not listed in the list of forum topics. If the parent document is added manually, everything is fine. I know BB application is old and based on XWiki 1.0 Syntax, but it's still valuable and there is no, as far as I now, replacement. I tried to find a source of the problem but I failed. Do somebody have any recommendation what to check and change in the code (or somewhere else) to solve the problem? With regards, Jan