Comment 1 for bug 629969

I created the object maintenance.contract in the security list, read only by employees.
Final error about sales order is :

Traceback (most recent call last):
  File "/usr/local/lib/python2.6/dist-packages/openerp-server_9920/netsvc.py", line 431, in dispatch
    result = ExportService.getService(service_name).dispatch(method, auth, params)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server_9920/service/web_services.py", line 589, in dispatch
    res = fn(db, uid, *params)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server_9920/osv/osv.py", line 57, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server_9920/osv/osv.py", line 135, in execute
    res = pool.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server_9920/osv/osv.py", line 125, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server_9920/addons/sale/sale.py", line 391, in create
    return super(sale_order, self).create(cr, uid, vals, context=context)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server_9920/osv/orm.py", line 3563, in create
    self.pool.get(object)._store_set_values(cr, user, ids, fields2, context)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server_9920/osv/orm.py", line 3685, in _store_set_values
    '"'+f+'"='+self._columns[f]._symbol_set[0] + ' where id = %s', (self._columns[f]._symbol_set[1](value),id))
  File "/usr/local/lib/python2.6/dist-packages/openerp-server_9920/sql_db.py", line 74, in wrapper
    return f(self, *args, **kwargs)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server_9920/sql_db.py", line 123, in execute
    res = self._obj.execute(query, params)
InternalError: current transaction is aborted, commands ignored until end of transaction block