Crystal Reports SubReport having a SubReport?

[C]

Hi,

I have a main Report which has a SubReport.

This SubReport also has a SubReport.

I set the data of my main Report and Subreport through code
DataSet dsMainReport = daLayer.GetMainReportData();
DataSet dsSubReport = daLayer.GetSubReportData();
string fileOutputPath =
Server.MapPath("../Reports/MainReport.rpt");

// Load the report
crReportDocument.Load(fileOutputPath);

//declare the tables
crTables = crReportDocument.Database.Tables;

//assign tables

crReportDocument.Database.Tables[0].SetDataSource(dsMainReport.Tables[0]);

crReportDocument.Subreports[0].Database.Tables[0].SetDataSource(dsSubReport.Tables[0]);

For the SubReport's SubReport I have set it to use a field on the SubReport
of the Main Report. Yet this SubReport does not get displated.

I only see the Main Report and it's SubReport.

Anyone know why? Can I have a Subreport which in turn has a SubReport?

Thanks.