PREPARATION:

1. Preheat oven to 375°F. Spray 8-inch square glass or ceramic baking dish with nonstick cooking spray.
2. Combine berries, lemon juice and 2 tablespoons pineapple juice in medium bowl. Sprinkle with 2 tablespoons flour; toss gently. Spoon into prepared baking dish; set aside.
3. Combine oats, walnuts, sugar, cinnamon, remaining 3 tablespoons flour and 1 tablespoon pineapple juice in small bowl. Pour margarine over oat mixture; mix until moistened. Spoon over fruit mixture.
4. Bake about 30 minutes or until topping is golden brown and fruit is hot. Serve warm.