Archive Configuration ignored

<executions>
  <execution>
    <id>makeExecJar_1</id>
    <phase>package</phase> 
    <goals>
      <goal>attached</goal>
    </goals>
    <configuration>
      <descriptors>
        <descriptor>assembly/my-assembly.xml</descriptor>
      </descriptors>
      <finalName>../../target/dist/final-1</finalName>
      <archive>
        <addMavenDescriptor>false</addMavenDescriptor>
        <manifest>
          <mainClass>my.package.MyMainClass</mainClass>
        </manifest>
      </archive>
    </configuration>
  </execution>
</executions>

<executions>
  <execution>
    <id>makeExecJar_1</id>
    <phase>package</phase> 
    <goals>
      <goal>attached</goal>
    </goals>
    <configuration>
      <descriptors>
        <descriptor>assembly/my-assembly.xml</descriptor>
      </descriptors>
      <finalName>../../target/dist/final-1</finalName>
      <archive>
        <addMavenDescriptor>false</addMavenDescriptor>
        <manifestFile>MY_MANIFEST.MF</manifestFile>
      </archive>
    </configuration>
  </execution>
</executions>