I am using JBPM BPEL olso. Havent you working with JBPM_BPEL_Beta1.3 version? With this version you have to create jbpm-bpel.sar file which contains jbpm-bpel.jar, war and other jbpm jars to JBoss server. What is your problem actually?
I believe jPDL-based jBPM and BPEL-based jBPM can NOT run on the same server at this moment.
Our team was working to correct that (and may have, my information could be old).