UML22 — Section: 12.3.33

The order cancellation request example lends itself to enhancement. Fig. 274 could be enhanced if there was drawn a fork from invoice providing multiple edges of "no payment needed" or "make payment" with the "no payment needed" edge directly entering the join. Another fork could also be added after the AcceptPayment activity with one outgoing edge labeled "refund payment" with an edge to an activity "IssueRefund" then an edge going to the join. The explanation would reiterate that a token transfer, once initiated (SendInvoice activity), that is outside of the region is not interruptable. That since the SendInvoice activity is outside the region, no matter when the CancelOrder interrupt activity is issued, the SendInvoice activity is issued. However, corrective activities are needed to be performed before the CloseOrder actvity can be accomplished. This would be to either issue the invoice stating no payment is due or to issue a refund once payment is received. Additionally, wouldn't the CancelOrder activity more likely go to the merge before the CloseOrder activity instead of directly to the Activity Final? Otherwise, logically thinking, some order is out there not closed (just canceled). But then maybe (probably??) I'm missing the point of the example in which case a better explanation of the example needs to be provided.

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