if (fromVertex.equals(toVertex)) {
            return;
        }

        if (fromProject != null) {
            MavenProject toProject = projectMap.get(toVertex.getLabel());
            fromProject.addProjectReference(toProject);
        }

        if (force && toVertex.getChildren().contains(fromVertex)) {
            graph.removeEdge(toVertex, fromVertex);
        }

        try {