Can we create any customizable pop-up message to show a warning/error message to end user in both new old and new UX?
No, I don't think you can do that.
@anaplan It should be introduced in Anaplan.
Thanks, but are you saying a button routine WOULD (not could) refresh that card without the user having to refresh the page?
Always more helpful if you would provide a solution example image. Suggested Example: Budget Submission button depressed.
BEFORE: Image of BUDGET SUBMISSION button in with blank card beside
AFTER: Image of BUDGET SUBMISSION button with populated message card beside saying "your budget is submitted, be sure to supply your budget narrative."