Procurement: compute stock minimum rules only generates Traceback

Warehouse > scheduler > Procurement Exception > Compute stock minimum rules only(wizard)

# when i run this wizard i got following Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.6/threading.py", line 532, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.6/threading.py", line 484, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/home/han/rdtool/addons/trunk/procurement/wizard/orderpoint_procurement.py", line 52, in _procure_calculation_orderpoint
    proc_obj._procure_orderpoint_confirm(cr, uid, automatic=proc.automatic, use_new_cursor=cr.dbname, context=context)
  File "/home/han/rdtool/server/trunk/openerp/osv/orm.py", line 476, in __getattr__
    return self[name]
  File "/home/han/rdtool/server/trunk/openerp/osv/orm.py", line 389, in __getitem__
    field_values = self._table.read(self._cr, self._uid, ids, field_names, context=self._context, load="_classic_write")
  File "/home/han/rdtool/server/trunk/openerp/osv/orm.py", line 3345, in read
    result = self._read_flat(cr, user, select, fields, context, load)
  File "/home/han/rdtool/server/trunk/openerp/osv/orm.py", line 3404, in _read_flat
    cr.execute(query, (tuple(sub_ids),))
  File "/home/han/rdtool/server/trunk/openerp/sql_db.py", line 152, in wrapper
    raise psycopg2.OperationalError(msg)
OperationalError: Unable to use a closed cursor.