best practice for an error condition in asynch event

Have a situation where I invoke a asynchronous server event .

Within the asynchronous call it is possible for the invoked application to return an error condition.

there is a method on serverItem to succesfully finish the server item myServerItem.Finish() and then progress to the next activity for the process.

I can not see any method to indicate that a serverItem has finished processing but unsuccesfully. In this case the process would halt with an error and the activity would have an error condition.

What would be the best way to handle this?

cheers

Gwyn