[m2] How to override a mirror in local settings

[Morgan Rachell]

I have maven-proxy running on an internal server. I have also updated
the parent pom.xml to include this:
 
 <repositories>
  <repository>
  <id>central</id>
  <name>Internal Mirror of Central Repository</name>
  <url>http://reposerver:9999/repository</url>
  </repository>
 </repositories>
 <pluginRepositories>
  <pluginRepository>
  <id>central</id>
  <name>Internal Mirror of Central Repository</name>
  <url>http://reposerver:9999/repository</url>
  </pluginRepository>
 </pluginRepositories>

So now the project pom has defined which "central" repository to use.
However, I noticed that if I put a <mirror> entry in my local maven2
settings.xml config, then maven will go straight to the mirror instead
of to the internal repo. I suppose this is by design, but I don't want
developers to be able to override the project setting  - at least not
for this project. Is there a way to force maven to ignore a <mirror>
setting from a parent pom?
 
Thanks
Morgan