Sample code:

EventData eventData = getEventData();

String navigateTo = eventData.getNavigateTo();

eventData.setValidationMessage(navigateTo);

Put it into a before save (or after save) crmscript trigger, expect result would be a dialog box with the content, instead you get an error about trying to print a bool as string:

Version: SuperOffice CRM Online 11.3 Build Release_11.3_2025.08.15-01