Process Modeling a Start Event

I have a process that can 'start' in two different swim lanes and I'm trying to figure out how to correctly represent this in JBDS. The determining factor as to which lane the process starts is who our outside/end customer chooses to contact - our internal sales rep or credit rep. Since a business process can have exactly one start event, how can this be represented in the process model? Can I have a start node outside the swim lanes that connects to an XOR gateway, which then branches to both lanes (and one is chosen based on a conditional expression)? Or, do I need to represent in 2 different business processes?

New to JBPM.

Thanks, in advance.