Fourth article in Error Handling (Background Error Checking or Green mark) series. Read these articles first to maintain continuity.
Auditors, Risk Managers, Everyone: Did you know? These green marks are WARNINGS!!
Green Marks Part 2: Formulas showing wrong results!
Green Marks Part 3: More error handling and Green Marks Part 4: Inconsistent Formulas
In this article, we cover the remaining three types of errors: Unprotected Formula, Formula refers to empty cells and Data Validation Error.