Since 6.0, Worklow tab is hidden by default and we don't use this feature by default.
As a result, we did not figure out that a couple of associated xhtml templates were not correctly migrated on jsf2.
Main issue is on workflow_content_view.xhtml actions.
task_action used to be ajax but not anymore, as a result we have errors due to mixed ajax and non-ajax requests caused by:
A possible solution for this issue is to make the actions non-ajax and remove the close of the fancybox.
Another issue is that, required fields from the layout introduced by:
are actually not required.
Task displayed in workflow_content_view.xhtml includes cancelled tasks.