Nice new feature in PCS. from the docs...
Correlations enable business processes to communicate with each other based on the state of an instance. The state of all the process data objects in a process defines the state of the instance.
When you define a correlation for a business process, you can identify an instance in another process based on the instance state and then send a message to that specific instance.
For example, you can use correlations to communicate a sales process with the corresponding shipping and mailing processes. When the customer confirms an order, the shipping process sends a message to the shipping and mailing processes using a correlation that defines that it uses the order ID to locate the instances in both processes. Read the complete article here.
For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center.