src/it/projects/active-profiles_multimodule/module/pom.xml

<?xml version="1.0" encoding="UTF-8"?>

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<project>
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>org.apache.maven.its.help</groupId>
    <artifactId>active-profiles_multimodule</artifactId>
    <version>1.0-SNAPSHOT</version>
  </parent>
  
  <artifactId>active-profiles_multimodule-module</artifactId>
  
  <profiles>
    <profile>
      <id>mph79-child</id>
      <activation>
        <file>
          <exists>${basedir}/pom.xml</exists>
        </file>
      </activation>
    </profile>
    <profile>
      <id>mph79-child-inactive</id>
    </profile>
  </profiles>
  
</project>