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Using the Mevenide project plug-in: http://mevenide.codehaus.org/mevenide-netbeans-project/index.html UML projects seem to break the round-trip they get after you import from a pre-existing Maven project. The reverse engineering works properly to import the UML objects. The nbproject/private/private.properties has the proper path to the Maven/Mevenide project. However, the "Navigate to Source" context item and the round-tripping code changes failt to work.
the maven projects don't contain any ant specific items in the project lookup, eg. no AntArtifact. That's probably the root of the problem.
This is sounds simliar to the when reverse engineering a Java Project from an exising Ant Script. During reverse engineering, we are not correctly creating the relative path to the source file artifact.
Integration between UML and Java Projects has changed significantly from 5.5 going into 6.x NB releases. Using NB6.5 and NB Maven module v4.0.5 (downloaded from AU using Plugin Manager Tools->Plugins) Reverse Engineering, Code Gen and Navigate To Source works ok.