Visibility of buildnumber-maven-plugin property ${buildNumber} - maven

Question

I am trying to use buildnumber-maven-plugin to append the SCM build number to the WAR artifact name and then use tomcat7-maven-plugin to deploy it but in a context path that doesn't include the build number. So I am making foo-r1234.war where foo is my project and 1234 is the revision number in Subversion but I want to deploy it in a Tomcat context foo.
I got the war generation to reflect the build number but the problem is that the Tomcat plugin doesn't see the ${buildNumber} property assigned by the buildnumber plugin:
<finalName>foo-r${buildNumber}</finalName>
...
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>buildnumber-maven-plugin</artifactId>
<version>1.4</version>
<executions>
<execution>
<id>create-buildno</id>
<phase>validate</phase>
<goals>
<goal>create</goal>
</goals>
</execution>
</executions>
<configuration>
<doCheck>false</doCheck>
<doUpdate>false</doUpdate>
</configuration>
</plugin>
...
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<configuration>
<url>http://localhost:8080/manager/text</url>
<path>/foo</path>
<warFile>${project.build.directory}/${project.build.finalName}.war</warFile>
</configuration>
</plugin>
I get
[ERROR] Failed to execute goal org.apache.tomcat.maven:tomcat7-maven-plugin:2.2:deploy (default-cli) on project foo: Cannot find war file: /my/path/target/foo-r${buildNumber}.war -> [Help 1]
[ERROR]
Which indicates the tomcat plugin doesn't see ${buildNumber}. How can I make it visible in order to deploy foo-r${buildNumber}.war to a context foo in Tomcat?
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Answer 1

Add build final name in configuration
/${project.build.finalName}