I had to update my openreports installtion to the latest birt version as we now use eclipse helios.
Checkout current openreports source with SVN from https://oreports.svn.sourceforge.net/svnroot/oreports
To replace birt 18.104.22.168 in openreports delete all files named birt_... in directory .../openreports/openreports/WebRoot/WEB-INF/lib
also delete everything in directory openreports/openreports/WebRoot/WEB-INF/plattform
Download birt runtime and birt RCP Designer from Birt Home (http://download.eclipse.org/birt/downloads/, birt-rcp-report-designer-3_7_0.zip, birt-runtime-3_7_0.zip) and unpack archives.
From birt runtime openreports/openreports/WebRoot/WEB-INF/plattform rename all jar files and add a prefix birt_3.7.0_...jar copy these jar into .../openreports/openreports/WebRoot/WEB-INF/lib
From RCP Designer copy directories .../birt-rcp-report-designer-3_7_0/configuration, ../birt-rcp-report-designer-3_7_0/plugins, ../birt-rcp-report-designer-3_7_0/features into openreports/openreports/WebRoot/WEB-INF/plattform
you need to rebuild openreports with the ant build file.