builds are added at the end of the build with the buildinfo file mechanism (but with an old version number). checking the build number with the new (correct version with hudson results to the following:

java.lang.NullPointerException
at hudson.plugins.sctmexecutor.service.SCTMService.buildNumberExists(SCTMService.java:229)
at hudson.plugins.sctmexecutor.service.SCTMReRunProxy.doBuildNumberExists(SCTMReRunProxy.java:131)
at hudson.plugins.sctmexecutor.service.SCTMReRunProxy.buildNumberExists(SCTMReRunProxy.java:126)
at hudson.plugins.sctmexecutor.SCTMExecutor.getOrAddBuildNumber(SCTMExecutor.java:177)
at hudson.plugins.sctmexecutor.SCTMExecutor.perform(SCTMExecutor.java:135)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:601)
at hudson.model.Build$RunnerImpl.build(Build.java:174)
at hudson.model.Build$RunnerImpl.doRun(Build.java:138)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:416)
at hudson.model.Run.run(Run.java:1257)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:127)