Maven looking for wrong archetype packaging

I successfully created an archetype. The archetype is referenced in my company's Nexus, the catalog looks well formed.

But when I try to generate a project from this archetype, maven will look for a jar, and my archetype is packaged as a 'maven-archetype' (see the stack trace below)

[INFO] [archetype:generate {execution: default-cli}]

[INFO] Generating project in Interactive mode

[INFO] No archetype defined. Using maven-archetype-quickstart (org.apache.maven.archetypes:maven-archetype-quickstart:1.0)

Choose archetype:

1: local -> com.XXX.archetypes:frameworkV4Project

Choose a number or apply filter (format: [groupId:]artifactId, case sensitive contains): : 1

Downloading: http://XXX/content/repositories/xxx-releases/com/xxx/archetypes/frameworkV4Project/1.0.0/frameworkV4Project-1.0.0.jar

[INFO] Unable to find resource 'com.XXX.archetypes:frameworkV4Project:jar:1.0.0' in repository frameworkV4Project-repo (http://XXX/content/repositories/XXX-releases)

Downloading:     http://XXX/content/groups/XXX//com/XXX/archetypes/frameworkV4Project/1.0.0/frameworkV4Project-1.0.0.jar

[INFO] Unable to find resource 'com.XXX.archetypes:frameworkV4Project:jar:1.0.0' in repository XXX (http://XXX/content/groups/XXX/)

Downloading: http://XXX/content/groups/bdx-dev//com/XXX/archetypes/frameworkV4Project/1.0.0/frameworkV4Project-1.0.0.jar

[INFO] Unable to find resource 'com.XXX.archetypes:frameworkV4Project:jar:1.0.0' in repository central (http://repo1.maven.org/maven2)

[INFO] ------------------------------------------------------------------------

[ERROR] BUILD FAILURE

[INFO] ------------------------------------------------------------------------

[INFO] The desired archetype does not exist (com.XXX.archetypes:frameworkV4Project:1.0.0)

[INFO] ------------------------------------------------------------------------

[INFO] For more information, run Maven with the -e switch

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 6 seconds

[INFO] Finished at: Fri Feb 10 16:38:13 CET 2012

[INFO] Final Memory: 28M/247M

[INFO] ------------------------------------------------------------------------

D:\workspace\xxx\frameworkV4Project>

here's the catalog file found on nexus :

<archetype-catalog>

 <archetypes>

  <archetype>

   <groupId>com.rte.archetypes</groupId>

  <artifactId>frameworkV4Project</artifactId>

  <version>1.0.0</version>

</archetype>

What am i missing ? need to define the archetype as a jar packaged archetype ? or can I specify somewhere the type of packaging maven must look for ?

Thank you,

Mathieu.