We selected oracle.apps.ont.oi.xml_int.status as the business event to use.
Good reference of how to set that up
https://community.oracle.com/thread/2337912?tstart=0
After that in JDeveloper/SOA Composite Application, create Oracle Application adapter, and then wire that to a BEPL component. In BPEL component, extract "HEADER_ID" in PARAMTER_LIST_ITEM element.