The "I/O Parameter" property sheet tab is missing for Business Rule Task nodes.
Kris, so is ScriptTask the only activity node that does not support I/O Parameter mapping?
For sub-processes we also don't use I/O mapping (not sure you consider those part of activity node or not so just mentioning to be safe).
OK, fixed in Luna build 1.1.1.201412091700 and kepler build 1.0.3.2014120917000.
*** Bug 1177304 has been marked as a duplicate of this bug. ***
Verified on: Kepler - BPMN2 Modeler 1.0.3.201501081652 jbds-8.0.2.GA_jbdsis-8.0.0.CR1.earlyaccess - BPMN2 Modeler 1.1.1.201501081320