Custom aggregations are special aggregations used for sophisticated mathematic and logic calculation purposes. They are created using the Formula Editor and are defined based on business view elements and built-in functions including aggregation functions, mathematic and logic calculation-related functions. For details about how to compose the expression of a custom aggregation, refer to Custom aggregations in the JReport Designer User’s Guide.
When using a custom aggregation in a data component, you need to make sure that the group objects referenced in the custom aggregation are also added as group by fields, column/row headers or chart axis fields in the data component.
