Hi Fernando,
Sorry for the delay in the response, I have tons of work to do right now.
Based on your description I can say that looks like more a camel route (http://camel.apache.org/) than a business process. Of course that you can model the situation that you mention with jBPM5, but probably you shoudl also analyze Camel in order to acomplish things like: Wait for a File, Transfer a File to an FTP server, etc.
Cheers