Cannot manually create an accounting entry

[TeMPO]

6.1 rc 1 Web client

I tried to create an entry in a bank journal
when I try to enter the first item in the entry I get

Client Traceback (most recent call last):
  File "/home/tempo/openerp-6.1rc1-20120112-173907/openerp/addons/web/common/http.py", line 176, in dispatch
    response["result"] = method(controller, self, **self.params)
  File "/home/tempo/openerp-6.1rc1-20120112-173907/openerp/addons/web/controllers/main.py", line 875, in default_get
    return Model.default_get(fields, req.session.eval_context(req.context))
  File "/home/tempo/openerp-6.1rc1-20120112-173907/openerp/addons/web/common/session.py", line 166, in eval_context
    return ccontext.evaluate(ctx)
  File "/home/tempo/openerp-6.1rc1-20120112-173907/openerp/addons/web/common/nonliterals.py", line 267, in evaluate
    final_context.update(context_to_eval.evaluate(ctx))
  File "/home/tempo/openerp-6.1rc1-20120112-173907/openerp/addons/web/common/nonliterals.py", line 267, in evaluate
    final_context.update(context_to_eval.evaluate(ctx))
  File "/home/tempo/openerp-6.1rc1-20120112-173907/openerp/addons/web/common/nonliterals.py", line 187, in evaluate
    raise ValueError('Error during evaluation of this context: "%s", message: "%s"' % (self.get_context_string(), e.message))
ValueError: Error during evaluation of this context: "{'lines':line_id ,'journal':journal_id }", message: "name 'line_id' is not defined"