I have an issue:

STEP 4:
Create the invoice (via former packingscreen) or via Menu → Stock Management → Outgoing products → packing to be invoiced. Pusch “Create” button to change status from Draft to Open

I get the following error report:

Local variable 'dif_res' referenced before assignment

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/openerp-server/netsvc.py", line 244, in dispatch
    result = LocalService(service_name)(method, *params)
  File "/usr/lib/python2.5/site-packages/openerp-server/netsvc.py", line 73, in __call__
    return getattr(self, method)(*params)
  File "/usr/lib/python2.5/site-packages/openerp-server/service/web_services.py", line 577, in exec_workflow
    res = service.exec_workflow(db, uid, object, method, id)
  File "/usr/lib/python2.5/site-packages/openerp-server/osv/osv.py", line 59, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/openerp-server/osv/osv.py", line 136, in exec_workflow
    res = self.exec_workflow_cr(cr, uid, obj, method, *args)
  File "/usr/lib/python2.5/site-packages/openerp-server/osv/osv.py", line 129, in exec_workflow_cr
    return wf_service.trg_validate(uid, obj, args[0], method, cr)
  File "/usr/lib/python2.5/site-packages/openerp-server/workflow/wkf_service.py", line 81, in trg_validate
    res2 = instance.validate(cr, id, ident, signal)
  File "/usr/lib/python2.5/site-packages/openerp-server/workflow/instance.py", line 50, in validate
    workitem.process(cr, witem, ident, signal, force_running, stack=stack)
  File "/usr/lib/python2.5/site-packages/openerp-server/workflow/workitem.py", line 62, in process
    ok = _split_test(cr, workitem, activity['split_mode'], ident, signal, stack)
  File "/usr/lib/python2.5/site-packages/openerp-server/workflow/workitem.py", line 175, in _split_test
    _join_test(cr, t[0], t[1], ident, stack)
  File "/usr/lib/python2.5/site-packages/openerp-server/workflow/workitem.py", line 183, in _join_test
    create(cr,[activity], inst_id, ident, stack)
  File "/usr/lib/python2.5/site-packages/openerp-server/workflow/workitem.py", line 42, in create
    process(cr, res, ident, stack=stack)
  File "/usr/lib/python2.5/site-packages/openerp-server/workflow/workitem.py", line 54, in process
    result = _execute(cr, workitem, activity, ident, stack)
  File "/usr/lib/python2.5/site-packages/openerp-server/workflow/workitem.py", line 108, in _execute
    wkf_expr.execute(cr, ident, workitem, activity)
  File "/usr/lib/python2.5/site-packages/openerp-server/workflow/wkf_expr.py", line 68, in execute
    return _eval_expr(cr, ident, workitem, activity['action'])
  File "/usr/lib/python2.5/site-packages/openerp-server/workflow/wkf_expr.py", line 58, in _eval_expr
    ret = eval(line, env)
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.5/site-packages/openerp-server/osv/orm.py", line 168, in <lambda>
    return lambda *args, **argv: getattr(self._table, name)(self._cr, self._uid, [self._id], *args, **argv)
  File "/usr/lib/python2.5/site-packages/openerp-server/addons/account/invoice.py", line 504, in action_move_create
    iml = self._get_analytic_lines(cr, uid, inv.id)
  File "/usr/lib/python2.5/site-packages/openerp-server/addons/account/invoice.py", line 462, in _get_analytic_lines
    iml = self.pool.get('account.invoice.line').move_line_get(cr, uid, inv.id)
  File "/usr/lib/python2.5/site-packages/openerp-server/addons/account_anglo_saxon.zip/account_anglo_saxon/invoice.py", line 107, in move_line_get
    res += diff_res
UnboundLocalError: local variable 'diff_res' referenced before assignment

This means I cannot validate the invoice.

Any help with this would be greatly appreciated.

Thanks,