src/it/reactor/module-z-deps-y/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
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<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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.apache.maven.its.dependency-tree</groupId>
  <artifactId>module-z-deps-y</artifactId>
  <version>1.0-SNAPSHOT</version>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>org.apache.maven.its.dependency-tree</groupId>
        <artifactId>module-y-deps-x</artifactId>
        <version>1.0-SNAPSHOT</version>
      </dependency>
    </dependencies>
  </dependencyManagement>

  <dependencies>
    <dependency>
      <groupId>org.apache.maven.its.dependency-tree</groupId>
      <artifactId>module-y-deps-x</artifactId>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <version>2.8</version>
        <dependencies>
          <dependency>
            <groupId>@project.groupId@</groupId>
            <artifactId>@project.artifactId@</artifactId>
            <version>@project.version@</version>
          </dependency>
        </dependencies>
        <executions>
          <execution>
            <id>default</id>
            <phase>validate</phase>
            <configuration>
              <outputFile>target/tree.txt</outputFile>
            </configuration>
            <goals>
              <goal>tree</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>