This is set in TFSbuild.proj if you use the update template (essentially, the update template runs this file, so Team Build behaves the same as TFS 2008). In the proj file you will see a section
<WorkItemType>Bug</WorkItemType> <WorkItemFieldValues>System.Reason=Build Failure;System.Description=Start the build using Team Build</WorkItemFieldValues> <WorkItemTitle>Build failure in build:</WorkItemTitle> <DescriptionText>This work item was created by Team Build on a build failure.</DescriptionText> <BuildlogText>The build log file is at:</BuildlogText> <ErrorWarningLogText>The errors/warnings log file is at:</ErrorWarningLogText> <UpdateAssociatedWorkItems>true</UpdateAssociatedWorkItems>
You can either comment on or delete everything below <!-- WorkItemType..... and add the following
<SkipWorkItemCreation>true</SkipWorkItemCreation>
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