Maven 2 build processor fails to find parent projects

Our current set up consists in several maven projects having the same parent pom project.
Note that this parent project is NOT an aggregate project meaning it does not any of all the other projects as modules - which is totally allowed in the maven world.

All our builds (except the one for the parent common pom project) seem to fail with the message:
17-Sep-2010 13:58:48 [INFO] BUILD SUCCESSFUL
17-Sep-2010 13:58:48 [INFO] ------------------------------------------------------------------------
17-Sep-2010 13:58:48 [INFO] Total time: 44 seconds
17-Sep-2010 13:58:48 [INFO] Finished at: Fri Sep 17 13:58:48 CST 2010
17-Sep-2010 13:58:48 [INFO] Final Memory: 51M/63M
17-Sep-2010 13:58:48 [INFO] ------------------------------------------------------------------------
17-Sep-2010 13:58:48 Build process for 'Libraries - projectX' returned with return code = 0
17-Sep-2010 13:58:48 Running post build plugin 'Artifact Copier'
17-Sep-2010 13:58:48 Running post build plugin 'Clover Results Collector'
17-Sep-2010 13:58:48 Running post build plugin 'NCover Results Collector'
17-Sep-2010 13:58:48 Running post build plugin 'Maven2 Build Processor'
17-Sep-2010 13:58:49 Failed to execute plugin 'Maven2 Build Processor' with error: Cannot find parent: our.organisation:master-pom for project: our.organisation:projectX:pom:1.1-SNAPSHOT for project our.organisation:projectX:pom:1.1-SNAPSHOT
17-Sep-2010 13:58:49 Finalising the build...

Although the build is marked as successful, the whole bamboo maven 2 dependency system which should set up the dependencies correctly is not triggered and none of the dependencies are set up.
I am not sure if the message relates anyhow to our problem though.

Thanks