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When you display the Process window for the Buyer: Receive Supplier PO Acknowledgement subprocess, you see that the subprocess consists of five unique activities. To examine the activities of the process in more detail, we have numbered each node for easy referencing below. The numbers themselves are not part of the process diagram.

The subprocess begins at node 1 with the Start activity. At node 2, the process waits to receive a purchase order acknowledgement event message from the supplier. If the acknowledgement is not received within a specified period of time, the subprocess performs a timeout activity to keep notifying the order requestor that the supplier has not responded until the acknowledgement is received. When the acknowledgement is received, the subprocess notifies the order requestor of the acknowledgement. The subprocess ends at this point.