To mark the result status as invalid, highlight the desired cell in your result table, then click the “Set validation” button in the table toolbar.
The entire row can be marked as invalid by selecting the entire row and clicking “Set validation”, and the entire column can similarly be marked as invalid by selecting the entire column.
Once it has been marked invalid, the result will show up with a yellow flag explaining the reason for invalidation.
If the result is later determined to be in fact valid, it can be validated through the same "Set validation" button. The flag will then turn blue.
When the flag is clicked, it displays the full history of validation changes.