Sale_intercompany error

I have installed the sale_intercompany module, but when i launch the shortcut after processing a PO, I get this error:

Traceback (most recent call last):
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/netsvc.py", line 489, in dispatch
    result = ExportService.getService(service_name).dispatch(method, auth, params)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/service/web_services.py", line 636, in dispatch
    res = fn(db, uid, *params)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/service/web_services.py", line 663, in exp_execute
    return self._execute(db, uid, wiz_id, datas, action, context)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/service/web_services.py", line 645, in _execute
    return wiz.execute(db, uid, self.wiz_datas[wiz_id], action, context)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/wizard/__init__.py", line 177, in execute
    res = self.execute_cr(cr, uid, data, state, context)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/wizard/__init__.py", line 72, in execute_cr
    action_res = action(self, cr, uid, data, context)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/addons/sale_intercompany/wizard/makesale.py", line 43, in _makeOrder
    shop_id = shop_obj.search(cr, uid, [])[0]
IndexError: list index out of range