Hi,
You need to add aclhandling in content-package-maven-plugin plugin in your content pom e.g.
<!-- ====================================================================== -->
<!-- V A U L T P A C K A G E P L U G I N -->
<!-- ====================================================================== -->
<plugin>
<groupId>com.day.jcr.vault</groupId>
<artifactId>content-package-maven-plugin</artifactId>
<extensions>true</extensions>
<configuration>
<filterSource>src/main/content/META-INF/vault/filter.xml</filterSource>
<verbose>true</verbose>
<failOnError>true</failOnError>
<group>myPorj</group>
<properties>
<acHandling>merge</acHandling>
</properties>
</configuration>
</plugin>