[6.1] shipping_api_ups: Error in UPS Quick Ship

Hi,

I was trying to use the UPS Quick Ship form in the Shipping menu but everytime I click the the Configure button, it gives me following error:

Client Traceback (most recent call last):
  File "/home/jgama/Projets/openerp/openerp-web-6.1/addons/web/common/http.py", line 180, in dispatch
    response["result"] = method(controller, self, **self.params)
TypeError: exec_workflow() takes exactly 5 arguments (4 given)

Openerp server version: 6.1.1 + ubuntu 11.10
Openerp-usa version: branch from trunk.

Thanks.