In this pattern there has to be two or more out going sequence flows that are NOT conditional flows for the pattern to be valid for parallel processing.
BPEL comments
1 A <flow> element is created to hold all of the outgoing sequence flows.
2 The ncname of the <flow> attribute is taken from the process definition name. "BPMN Process".name
3 A <sequence> element is created for each outgoing sequence flow that does not have a conditional value, this value is determined from the sequence flow symbol "Sequence Flow" Condition. The sequence name is taken from the sequence flow name. Sequence Flow.name. If the sequence is unnamed then an unamed sequence element is created
4 All activities proceeding their respective sequence flow reside completely contained within their respective sequence element and occupy the Target Activity place holder.