Unable to find artifact version under unpack goal

[Ty Cuz]

I have problem when unpacking the dependency jar if no version is specified.
I have the following structure:

root
 |-- module1
 |-- module2
 |-- assembly
       |-- cli
And the following is extracted from root/assembly/cli/pom.xml:

         <execution>
           <id>unpack</id>
           <phase>package</phase>
           <goals>
             <goal>unpack</goal>
           </goals>
           <configuration>
             <artifactItems>
               <artifactItem>
                 <groupId>groupX</groupId>
                 <artifactId>moduleX</artifactId>
                 <outputDirectory>${pom.basedir
}/target/resources</outputDirectory>
               </artifactItem>
             </artifactItems>
           </configuration>
         </execution>

I did not include <version>, because I have included
groupX:moduleX:0.1.0under <dependencyManagement> in root/pom.xml

However, it works if I execute from:
root/assembly/cli> mvn package

But it complaint "Unable to find artifact version of groupX:moduleX in
project's dependency management." if it is executed from:
root/assembly> mvn package

Anybody knows what is happening?  Please let me know if you required more
information.

thanks,
Ty