Have you tried an empty reports-tag?
http://maven.apache.org/ref/3.0.4/maven-model/maven.html#class_reportSet
> From: mfriedenha...@gmail.com
> Date: Tue, 15 Jan 2013 21:13:53 +0100
> To: user@mojo.codehaus.org
> Subject: [mojo-user] How to exclude a report defined in a parent pom?
>
> Hello,
>
> I am playing with jacoco for code-coverage. Now in my parent-pom I
> have already defined cobertura for this. While it is quite easy to
> disable the instrumentation via cobertura by setting the property
> cobertura.skip=true, building the site always fails, as
> cobertura:cobertura does not find the results.
> Is there a way to exclude a specific report in a child project?
>
> Regards Mirko
>
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