Rails - Mar 2008 - UPS delivery package service select

Hi guys:
  I''m using gem shipping for my project,i wanna select UPS delivery
package service, but it doesn''t work for me whatever value i send to
UPS
api.
the following is some code i used.
UPS_SERVICE = {
      ''UPS Next Day Air'' => ''01'',
      ''UPS Second Day Air'' => ''02'',
      ''UPS Ground'' => ''03'',
      ''UPS Next Day Air® Early A.M. SM'' =>
''14''
}

shipping_params = {
              :zip => customer.shipping_zip,
              :state => customer.shipping_state_province,
              :sender_zip => SystemSetting.named(''Shipping
Zip''),
              :sender_state => SystemSetting.named(''Shipping
State''),
              :weight => items_weight,
              :code   => session[:code] || "03",      # default UPS
service: UPS Ground
              :prefs => "#{RAILS_ROOT}/config/shipping.yml"
            }

any guys have any good idea?
thanks.
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