Jenkins Job Builder, override a parameter at project level

define.yaml

# Testing Jenkins Job Builder
#
# git clone git://gist.github.com/4251317.git
# mkdir testoutput
# jenkins-jobs -l debug test 4251317 -o testoutput
# grep command outtemplate/*

# Basic macro, takes a 'parameters' parameter
- builder:
    name: resolve-deps
    builders:
        - shell: "echo {parameters}"

# The template that wich takes two parameters: name & db
- job-template:
    name: '{name}-{db}-compile'
    builders:
     - resolve-deps:
         parameters: "{parameters}"

- job-group:
    name: jobs-for-dumb-project
    jobs:
     - '{name}-{db}-compile'

- project:
    name: dumb-project
    parameters: "GLOBAL DEFAULT"
    db:
     - mysql
     - postgresql
     - sqlite
    jobs:
     # Realize the three jobs:
     - jobs-for-dumb-project
     # We want to override some parameter for sqlite:
     - '{name}-{db}-compile':
        name: dumb-project
        db: sqlite
        parameters: "Set per JOB"

Should this snippet work? I get this error message:

jenkins_jobs.errors.JenkinsJobsException: Duplicate definitions for job 'dumb-project-sqlite-compile' specified