Hi James,
I am having the same problem.. but according to your solution
<parameters>
<object name="invoiceId" expr="#{invoiceId}" />
</parameters>
<object> has a param called "name" but according to the XSD there is no parameter called "name" inside object.
ref: http://docs.jboss.com/jbpm/v4/schemadocs/
Kindly help me with this.
Samrat