[hr_timesheet_invoice] : Error when trying to reinvoice

Hello!

I was using hr timesheet, project modules to track time spent on different tasks and to create invoices.

Everything works as expected, a newinvoice is created.

However, if I try to create another invoice (for whatever reason, mistake included) the following traceback shows-up:

1. go to Project>Invoice>Invoice tasks
2. select already invoiced lines
3. click action>fill in the dialog box if needed, click create invoice
4. traceback:

Environment Information :
System : Linux-2.6.35-28-generic-i686-with-Ubuntu-10.10-maverick
OS Name : posix
Distributor ID: Ubuntu
Description: Ubuntu 10.10
Release: 10.10
Codename: maverick
Operating System Release : 2.6.35-28-generic
Operating System Version : #49-Ubuntu SMP Tue Mar 1 14:40:58 UTC 2011
Operating System Architecture : 32bit
Operating System Locale : fr_CH.UTF8
Python Version : 2.6.6
OpenERP-Client Version : 6.1-dev
Last revision No. & ID :Bazaar Package not Found !Traceback (most recent call last):
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/netsvc.py", line 410, 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 598, in dispatch
    res = fn(db, uid, *params)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/osv/osv.py", line 122, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/osv/osv.py", line 176, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/osv/osv.py", line 167, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/home/openerp/addons/hr_timesheet_invoice/wizard/hr_timesheet_invoice_create.py", line 129, in do_create
    data['product'] = data['product'][0]
TypeError: 'int' object is unsubscriptable

While it is maybe correct NOT to recreate the same invoice, an error message should capture this event, and not a blocking error.

thank you!

bogdan