It is currently not possible to have nested list components as it results in the following exception when compiling the report:
java.lang.NullPointerException
at net.sf.jasperreports.engine.JRExpressionCollector.getDatasetCollector(JRExpressionCollector.java:284)
...
iReport needs to be updated to handle this as well as the nested list component is blank although it does contain elements.
This would be a very nice feature in addition to subreports.
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