I created a sample workbook to show how to display a warning when certain values in a quick filter and parameter are selected. Instructions are included below and on Sheet 2 and Dashboard 1 in the attached workbook. Let me know if this helps!
1. Create Display Warning Calculated Field:
IF Region="International" THEN
WHEN "No Warning" THEN "filterout"
WHEN "Show Warning" THEN "Warning message text"
2. On a new worksheet, place Display Warning on the Filters shelf and deselect "filterout"
3. Place Display Warning on Text and format the view as needed.
4. Place the new worksheet on the dashboard.
If the Parameter is set to "Show Warning" and "International" is selected in the Region filter then the warning message will display.
DisplayWarning.twbx 1.0 MB