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1. On the task where you want to use the boundary event select "Append Intermediate/Boundary Event"

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2. Drag the circle symbol on one border of the task.

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Image Removed3. Select "Message Boundary Event" to add an interrupting boundary event, or "Message Boundary Event (non-interrupting)" for non-interrupting.

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5. If the task supports the selected event, one should see a tab "Task Configuration" in the property grid.

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6. In that tab, select one of the supported boundary event. In this example there is only the "TranscodingStarted" event.

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