This problem is somehow related to
ODE-758. I've a one BPEL process which implements two WSDL portTypes. The process is deployed separately at two tomcat servers. Inside the deployment descriptor (deploy.xml) I bound the partnerLinks to the remote and local process. When I invoke, inside the first process, an operation of the second WSDL portType at the remote process, ODE uses the internal Process2Process allthough the partnerlink points to an external location. Thus the message is actually never sent to the second tomcat. Fortunately I found a easy way to fix this problem and appended the corresponding patch.