The fix for https://jira.jboss.org/jira/browse/JBPM-1775 does not work in JTA environment with JtaDbPersistenceService and following config:

jbpm-context>
<service name="persistence">
<factory>
<bean class="org.jbpm.persistence.jta.JtaDbPersistenceServiceFactory">
<field name="isCurrentSessionEnabled"><true /></field>
<field name="isTransactionEnabled"><false /></field>
</bean>
</factory>
</service>
<service name="tx" factory="org.jbpm.tx.TxServiceFactory"/>
<service name="message" factory="at.telekom.wfm.process.queue.JbpmJmsMessageServiceFactory" />
<service name="scheduler" factory="org.jbpm.scheduler.db.DbSchedulerServiceFactory" />
<service name="authentication" factory="org.jbpm.security.authentication.DefaultAuthenticationServiceFactory" />
</jbpm-context>