Enclosed is an example of a BPMN process in a pool interacting with another BPMN pool. Also noteworthy is the correct usage of event based gateway. I am using Oracle BPMN solution's latest version to model this diagram. The BPMN visual extension capability has been used to create the color coded human (green) and automated (blue) tasks. This will further enhance the readability of the BPMN diagaram in Oracle BPA Suite.