I have a spreadsheet that's basically a grid checklist, let's say 10 columns and 20 rows.
There are multiple cells that have
N/A as the value, and I'm worried going through the checklist that one might accidentally be changed.
So I'd like to protect all cells that equal
N/A and show a warning if that value is changed. However other cells that do not have
N/A should not be validated.
Is this possible, without or with a script?