Promoting from Development to QA works fine
Attempting to promote a build from QA to AlphaRelease gives

2007-03-05 16:34:45,615 [http-8080-Processor13] INFO - Working directory of current configuration: D:\qbWork\root\SQA\AV_Tools\av2tiff
2007-03-05 16:34:45,615 [http-8080-Processor13] INFO - Publish directory of current configuration: D:\qbPublish\root\SQA\AV_Tools\av2tiff
2007-03-05 16:34:45,615 [http-8080-Processor13] INFO - Triggering configuration: root.SQA.AV_Tools.av2tiff
2007-03-05 16:34:45,661 [http-8080-Processor13] INFO - Checking build necessary condition...
2007-03-05 16:34:45,693 [http-8080-Processor13] ERROR - Failed to trigger configuration.
java.lang.RuntimeException: ognl.OgnlException: source is null for getProperty(null, "source")
at com.pmease.quickbuild.model.Configuration.evaluateStringExpression(Configuration.java:892)
at com.pmease.quickbuild.model.Configuration.getVersionForNewBuild(Configuration.java:961)
at com.pmease.quickbuild.model.Configuration.trigger(Configuration.java:1037)
at com.pmease.quickbuild.RemoteServiceImpl.triggerDependent(RemoteServiceImpl.java:88)
at sun.reflect.GeneratedMethodAccessor5757.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)