Vertical line for sysdate in a Gantt chart

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I'm using a Gantt chart to show the time between the start date and due date for various tasks, with the Date being the horizontal axis and the task being the vertical axis, and I want to show the sysdate as a vertical line.

I've tried adding an exception with just the expression 'sysdate()' and it produced a horizontal line which just looks a bit odd.

Does anyone know how to do it?

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