please upgrade model plugins version to 2.6.0 in cvs head for 2.6.0 daily build.
following plugin's bundle version have been updated to 2.6.0:

org.eclipse.birt.report.model
org.eclipse.birt.report.model.adapter.oda.tests
org.eclipse.birt.report.model.adapter.oda
org.eclipse.birt.report.model.tests
org.eclipse.birt.resources
verified in daily build 201003090630. bug closed.