return new DefaultProblemId(problemId.getName(), problemId.getDisplayName(), toInternalGroup(problemId.getGroup()));
    }

    private static InternalProblemGroup toInternalGroup(ProblemGroup group) {
        return new DefaultProblemGroup(group.getName(), group.getDisplayName(), group.getParent() == null ? null : toInternalGroup(group.getParent()));
    }