The user interface includes a formula bar above each report, which will display the formula for the selected cell.
You can view both excel type formulas and custom formulas in the bar.
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For long formulas, the formula bar is expandable.
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Note:
If the excel formula contains a reference to both row and column at once or a custom formula with a combination of the words RC, then the calculation doesn't work. For Example: =SUMIF($E$10:$E$13,"RC",I$10:I$13) is rendered as =SUMIF($E$10:$E$13,"T7",I$10:I$13).