jbpm.cfg.xml : resource.hibernate.properties seems to be ignored.

jbpm.cfg.xml has the following content:

<jbpm-configuration>

<string name='resource.hibernate.properties' value='/be/fgov/minfin/stirint/gen/common/resources/PropertyGetter.properties'/>
<string name='resource.hibernate.cfg.xml' value='/be/fgov/minfin/stirint/gen/bpm/hibernate.cfg.xml'/>

</jbpm-configuration>

However the value given to the property resource.hibernate.properties seems to be ignored, because in the logs I get:

...
[2009-07-28 23:30:42,953] [INFO ] [org.jbpm.JbpmConfiguration] [] : using configuration resource: jbpm.cfg.xml
[2009-07-28 23:30:43,328] [INFO ] [org.hibernate.cfg.Environment] [] : Hibernate 3.2.6
[2009-07-28 23:30:43,328] [INFO ] [org.hibernate.cfg.Environment] [] : hibernate.properties not found
[2009-07-28 23:30:43,343] [INFO ] [org.hibernate.cfg.Environment] [] : Bytecode provider name : cglib
[2009-07-28 23:30:43,343] [INFO ] [org.hibernate.cfg.Environment] [] : using JDK 1.4 java.sql.Timestamp handling
[2009-07-28 23:30:43,406] [INFO ] [org.hibernate.cfg.Configuration] [] : configuring from resource: /be/fgov/minfin/stirint/gen/bpm/hibernate.cfg.xml
[2009-07-28 23:30:43,406] [INFO ] [org.hibernate.cfg.Configuration] [] : Configuration resource: /be/fgov/minfin/stirint/gen/bpm/hibernate.cfg.xml
...

Also in hibernate.cfg.xml I refer to the property ${datasource} as datasource JNDI name which is defined in my PropertyGetter.properties, but apparently it's not replaced when I do a unit test.