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[Dominique Chabord <dominique.chabord@xxxxxxxxxx>]

It seems we can reproduce :

http://www.openerp.com/forum/topic24883.html
hope this helps

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https://bugs.launchpad.net/bugs/777438

Title:
  paying invoice error in client (web) side (account_voucher.py)

Status in OpenERP Web Client:
  Incomplete

Bug description:
  1) In openerp 6.0.2, web client, trying to pay an invoice (created
  from sales order or directly)

  2) [2011-05-04 16:35:16,614][DEMOSYNCHBASE] ERROR:web-services:Uncaught exception
  Traceback (most recent call last):
    File "/home/jplevy/baazar-projects/openerp60/server/bin/osv/osv.py", line 122, in wrapper
      return f(self, dbname, *args, **kwargs)
    File "/home/jplevy/baazar-projects/openerp60/server/bin/osv/osv.py", line 196, in exec_workflow
      res = self.exec_workflow_cr(cr, uid, obj, method, *args)
    File "/home/jplevy/baazar-projects/openerp60/server/bin/osv/osv.py", line 189, in exec_workflow_cr
      return wf_service.trg_validate(uid, obj, args[0], method, cr)
    File "/home/jplevy/baazar-projects/openerp60/server/bin/workflow/wkf_service.py", line 80, in trg_validate
      res2 = instance.validate(cr, id, ident, signal)
    File "/home/jplevy/baazar-projects/openerp60/server/bin/workflow/instance.py", line 48, in validate
      workitem.process(cr, witem, ident, signal, force_running, stack=stack)
    File "/home/jplevy/baazar-projects/openerp60/server/bin/workflow/workitem.py", line 61, in process
      ok = _split_test(cr, workitem, activity['split_mode'], ident, signal, stack)
    File "/home/jplevy/baazar-projects/openerp60/server/bin/workflow/workitem.py", line 174, in _split_test
      _join_test(cr, t[0], t[1], ident, stack)
    File "/home/jplevy/baazar-projects/openerp60/server/bin/workflow/workitem.py", line 182, in _join_test
      create(cr,[activity], inst_id, ident, stack)
    File "/home/jplevy/baazar-projects/openerp60/server/bin/workflow/workitem.py", line 41, in create
      process(cr, res, ident, stack=stack)
    File "/home/jplevy/baazar-projects/openerp60/server/bin/workflow/workitem.py", line 53, in process
      result = _execute(cr, workitem, activity, ident, stack)
    File "/home/jplevy/baazar-projects/openerp60/server/bin/workflow/workitem.py", line 107, in _execute
      wkf_expr.execute(cr, ident, workitem, activity)
    File "/home/jplevy/baazar-projects/openerp60/server/bin/workflow/wkf_expr.py", line 68, in execute
      return _eval_expr(cr, ident, workitem, activity['action'])
    File "/home/jplevy/baazar-projects/openerp60/server/bin/workflow/wkf_expr.py", line 58, in _eval_expr
      ret = eval(line, env, nocopy=True)
    File "/home/jplevy/baazar-projects/openerp60/server/bin/tools/safe_eval.py", line 284, in safe_eval
      return eval(test_expr(expr,_SAFE_OPCODES, mode=mode), globals_dict, locals_dict)
    File "", line 1, in <module>
    File "/home/jplevy/baazar-projects/openerp60/server/bin/osv/orm.py", line 181, in <lambda>
      return lambda *args, **argv: attr(self._cr, self._uid, [self._id], *args, **argv)
    File "/home/jplevy/baazar-projects/openerp60/server/bin/addons/account_voucher/account_voucher.py", line 559, in proforma_voucher
      self.action_move_line_create(cr, uid, ids, context=context)
    File "/home/jplevy/baazar-projects/openerp60/server/bin/addons/account_voucher/account_voucher.py", line 754, in action_move_line_create
      if not currency_pool.is_zero(cr, uid, inv.currency_id, line_total):
    File "/home/jplevy/baazar-projects/openerp60/server/bin/addons/base/res/res_currency.py", line 90, in is_zero
      return abs(self.round(cr, uid, currency, amount)) < currency.rounding
    File "/home/jplevy/baazar-projects/openerp60/server/bin/addons/base/res/res_currency.py", line 87, in round
      return round(amount / currency.rounding) * currency.rounding
  TypeError: unsupported operand type(s) for /: 'float' and 'NoneType'

  3) Pay normally as before

  4) Linux  10.0.04 LTS, PostgresSql 8.4

  5) 6.02 (Stable) revisions:  Server: 3416; Web-client: 4592; gtk-
  client: 1841; addons: 4557; extra-addons: 5428

  Thanks in advance,
  Juan Pablo