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The Formula step can calculate Formula Expressions within a data stream. It can be used to create simple calculations like [A]+[B] or more complex business logic with a lot of nested if / then logic.
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When you press on the Formula cell entry, the formula editor window opens and gives you help on the available functions:
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The formula editor window does a direct check on the syntax and the field names supplied. In case of an error you get the error message direct, for instance:
