U.S. Treasury Undersecretary Erin Browne Says G20 Countries Are Working Hard On Joint Communique But It Must Reflect U.S. Interests; There Are Differences Between Trade Surplus Countries And Deficit Countries On Challenges Posed By Global Imbalances; Some Disagreements Remain Over Language On Sovereign Debt Restructuring And Reducing Global Imbalances; If G20 Finance Communique Is Not Possible The U.S. Will Issue Chair's Statement Reflecting U.S. Priorities