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Boundary Exception

A boundary exception is a way to model possible errors or exceptions in a workflow model. A button will appear in the activity in which the error should be spotted. If this button is clicked, an alternate path in the workflow model will be executed.

Modeling

By double-clicking an activity in which the error/exception the process-properties-popup will open. Then you have to select “Outcomes” on the left side of the pop-up and click on the tab “Exceptions”. To create a new error you have to click on the red “flash”.

This will open a new pop-up with the name “Define error”. Here a new error/exception can be created and named. If a connection to another activity is created now, it will be marked as “exception-handling-connection” with a “flash” at the beginning of the connection.
If a user will see the activity in the ToDo client, a button with the name of the exception will appear. If a user clicks it, the modeled path for this exception will be executed.