1. Coat a large nonstick skillet with cooking spray; place skillet over medium-high heat until hot. Add mushrooms, and cook 5 minutes or until tender. Set aside; keep warm.
2. While mushrooms cook, place flour, salt, and pepper in a large heavy-duty zip-top plastic bag. Seal bag; shake to mix. Add veal; seal bag, and shake to coat veal. Remove veal from flour mixture, and reserve 1 tablespoon flour mixture; discard remaining flour mixture.
3. Melt margarine in skillet over medium-high heat. Add veal, and cook 3 minutes on each side or until browned. Transfer veal to a serving platter, and keep warm.
4. Combine wine and reserved 1 tablespoon flour mixture, stirring well with a wire whisk; add to skillet. Bring to a boil, scraping browned particles that cling to bottom of skillet. Spoon mushroom mixture and wine mixture over veal.