Is JasperReport/iReport support subreport of subreport?? (PLEASE SUGGEST, SO FRUSTRATED)

[jasperbox]

The javabean datasource has a list of list of collection, and each collection has a list of collections. And then I used the subreport to accomplish that. I'm able to make the subreport for the list of collection, but I cannot go to the next level (Dist and SpecialAppt Lists in below) and it always has error cannot find the bean. When I do the subreport of subreport, I'm not sure what's missing and I used the same approach I did for subreport.

Am I in the wrong approach? Please advise what's the CORRECT way to design the following Java Bean Hierarchies: Thanks so much, and I really so frustrated and don't know what to do.

public class Account implements java.io.Serializable {

    private String acctId;
    private String acctType;
    private List<Appt> apptList = new ArrayList<Appt>();
    //etc...
}

public class Appt implements Serializable {

    private String apptId;
    private List<Dist> distList = new ArrayList<Dist>();
    private List<SpecialAppt> ppsAppList = new ArrayList<SpecialAppt>();
    //etc...
}

public class Dist  {....}

public class SpecialAppt { ...}