The DRV usage type is given to function fields that perform a user-defined calculation specified by an action diagram. The field can then be used in any function where the calculation is required. This method of definition cannot be used if the field to be counted is not itself a numeric field.
A DRV function field has one output parameter: the derived field itself. Input parameters may be specified for the function.
You can edit the action diagram and specify the parameters for the derived field.
Examples of DRV fields include:
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