src/it/projects/bugs/massembly-285/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>org.apache.maven.plugin.assembly.test</groupId>
    <artifactId>it-project-parent</artifactId>
    <version>1</version>
  </parent>
  
  <artifactId>massembly-285</artifactId>
  <packaging>pom</packaging>
  
  <modules>
    <module>massembly-285-mod1</module>
    <module>massembly-285-mod2</module>
    <module>massembly-285-assembly</module>
  </modules>
  
  <build>
    <pluginManagement>
      <plugins>
        <plugin>
          <artifactId>maven-assembly-plugin</artifactId>
          <configuration>
            <archiverConfig>
              <duplicateBehavior>skip</duplicateBehavior>
            </archiverConfig>
          </configuration>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>