I hope, too, but the latest version 6.0 (alpha or whatever is) in a TASK table in databese does not have the field so it is unlikely to work.
see for example:
http://grepcode.com/file/repo1.maven.org/maven2/org.jbpm/jbpm-human-task-core/6.0.0.Alpha6/org/jbpm/task/TaskData.java?av=f
ts