Place the wheat berries in a medium bowl, and cover with water to 2 inches above wheat berries. Cover and let stand 8 hours. Drain.
Place wheat berries and 1/2 teaspoon salt in a medium saucepan. Cover with water to 2 inches above wheat berries; bring to a boil. Cover, reduce heat, and cook 1 hour or until tender. Drain; cool to room temperature.
Combine cranberries and maple syrup in a small saucepan over medium heat; bring to a boil. Cook for 4 minutes or until cranberries pop, stirring frequently. Transfer to a large bowl; cool 10 minutes.
Add juice, oil, vinegar, mustard, pepper, and remaining 1/2 teaspoon salt to cranberry mixture; stir well to combine. Add wheat berries, celery, onion, parsley, and pecans to cranberry mixture; stir well. Serve at room temperature, or cover and chill.