Checking a Flow for Errors
Dataflow Designer automatically checks a flow for errors when you run a flow, run inspection, expose a flow, or save an exposed flow. You can also check for errors by clicking the validation button .
When an error is found, the Validation pane appears at the bottom of the Spectrum Enterprise Designer window. Click an error to highlight the error on the canvas. Double-click an error to open the options window of the item containing the error.