GWT does not respect maven-war-plugin configuration

I've got the following configuration within my Maven's pom.xml file:

    <pluginRepositories>
        <pluginRepository>
            <id>central</id>
            <name>Maven Plugin Repository</name>
            <url>http://repo2.maven.org/maven2/</url>
        </pluginRepository>
    </pluginRepositories>

    (...)

    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.4</version>
        <configuration>
            <warSourceDirectory>${basedir}/war</warSourceDirectory>
            <archiveClasses>true</archiveClasses>
        </configuration>
    </plugin>

The problem is that GWT seems to not take that configuration seriously. After choosing Maven -> Update Project... I receive an error:

    WAR source directory /MyProject/src/main/webapp is missing

which suggests that GWT tries to use default WAR directory. After Maven repository clean, deleting Eclipse's .settings folder content and executing Update Project... again, Eclipse/GWT recreates com.google.gdt.eclipse.core.prefs file which contains property:

    warSrcDir=src/main/webapp

Changing manually WAR directory field at project -> Properties -> Google -> Web Application to "war" solves the problem, but every time I execute Update Project..., Eclipse/GWT sets WAR directory back to "src/main/webapp".

Thanks for any help. :)

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