Find the formulas behind your data
Drop a spreadsheet and Regrex tells you which columns are computed from other columns, with which formula, and which rows break the rule.
You can also paste cells copied from a spreadsheet (Ctrl+V).
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Untick columns that are not data, such as IDs or invoice numbers.
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Test your own formula
Use column names. Any other name, such as rate, is a constant that Regrex fits for you.
How the columns depend on each other
An arrow goes from each column to the columns computed from it. Select a computed column to go to its formula.
These rows break a formula that almost every other row follows, so they are probably typing or copy mistakes. The cell that breaks the rule is highlighted.