Generating BIRT reports with a scheduler

Hello,
I need to automate the BIRT report generation via a scheduler to generate PDFs. I think I have 2 possibilities:
1) Using the runReport batch file:
I can generate the sample report but when I want to generate a Jazz (RTC-based) report I get the error:

  Mar 15, 2013 1:58:12 PM org.eclipse.birt.data.engine.odaconsumer.Driver doGetDri verManifest SEVERE: Cannot find or process the ODA data source extension configuration. java.lang.IllegalArgumentException: Cannot find the ODA dataSource extension (co m.ibm.team.reports.generic.dataSource). Check the workspace log file for any problems with loading the extension bundle and its dependencies. at org.eclipse.datatools.connectivity.oda.util.manifest.ManifestExplorer .getExtensionManifest(ManifestExplorer.java:200)

What am i doing wrong? I check the ODA jar is part of the BIRT runtime...

2) Do the export to PDF from the Web UI:
I call com.ibm.team.reports.service.internal.IReportViewerService with the parameters:
 __format=pdf
.__projectAreaUUID=xxx (pass in the UUID of the project area containing the report)
__ownerUUID=xxx (pass in the UUID of the contributor who is making the request)

However how to a create a script to specify the output file name and to handle the authentication?

Has anyone done that? Is it possible?
Anything pointers are greatly appreciated.

Thanks in advance