Guide / Every rule

Boundary event is off its host

The check drawing/boundary-off-host, in the group Drawing.

Error

Why it matters

A boundary event that is not on the border of the task it is attached to looks like a free-standing event.

How to fix it

Drag the boundary event back onto the border of its task.

Where you see it

The Problems tab lists it under Problems, and outlines the element on the canvas. In a terminal, penstock check --only drawing reports it as BOUNDARY-OFF-HOST. Auto layout often fixes it for the whole diagram at once.

Rule details

Read more: Diagram check. All rules: Every rule.