Guides/ReportDesign/15.0-Expressions-in-Izenda.md
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_**Note:** Case statements became available as of version 6.7.0.262._
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-_**Note:** You can nest other functions inside case statements using parenthesis around each nested function (e.g. **case when (SUM([Freight)) > 100 THEN (SUM([Freight])) * (COUNT(OrderID)) ELSE (SUM([Freight])) END**)._
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+You can also nest other functions inside case statements using parenthesis around each nested function (e.g. **case when (SUM([Freight)) > 100 THEN (SUM([Freight])) * (COUNT(OrderID)) ELSE (SUM([Freight])) END**). The results of the case expression **must** be of the same datatype, but they do not have to correspond to the datatype of the field you selected (e.g. selecting [Freight] and then outputting 'Valid' or 'Invalid' will work, but outputting [Freight] or 'Invalid' will not). This is a limitation within SQL itself.
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More information about using this function can be found [[here|http://msdn.microsoft.com/en-us/library/ms181765.aspx]].
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