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You should avoid the query parameter (even if the variable is a message) and use the above alternative instead. Besides providing a way to query non-message variables, it has an added benefit. The query is syntactically analyzed during deployment. In the function call, the query parameter is analyzed till runtime.
Many thanks Alex.
PS: We found number of issues while upgrading JBPM beta to JBPM GA on Oracle and SQL Server. They are mostly hibernate issues though. Just FYI. If you are interested I can send you detailed email about issues.