From Product Form view - Cant open Purchase

[Amit Bhavsar (Open ERP)]

Problem : From Product Form view - Cant open Purchase
        products -- > products Form view ...
                      step : 1 At the Right Side Bar .... Under the "Links"
                      step : 2 click on the Purchase

           : A Traceback Found :
           =============================================================
           Client Traceback (most recent call last):
              File "/home/amb/source/web-client/addons/web/common/dispatch.py", line 161, in dispatch
                response["result"] = method(controller, self, **self.params)
              File "/home/amb/source/web-client/addons/web/controllers/main.py", line 754, in call
                return self.call_common(req, model, method, args, domain_id, context_id)
              File "/home/amb/source/web-client/addons/web/controllers/main.py", line 738, in call_common
                c, d = eval_context_and_domain(req.session, context, domain)
              File "/home/amb/source/web-client/addons/web/controllers/main.py", line 470, in eval_context_and_domain
                e_context = session.eval_context(context)
              File "/home/amb/source/web-client/addons/web/common/session.py", line 166, in eval_context
                return ccontext.evaluate(ctx)
              File "/home/amb/source/web-client/addons/web/common/nonliterals.py", line 257, in evaluate
                final_context.update(context_to_eval.evaluate(ctx))
              File "/home/amb/source/web-client/addons/web/common/nonliterals.py", line 257, in evaluate
                final_context.update(context_to_eval.evaluate(ctx))
              File "/home/amb/source/web-client/addons/web/common/nonliterals.py", line 179, in evaluate
                return eval(self.get_context_string(), SuperDict(ctx))
              File "<string>", line 1, in <module>
              File "/home/amb/source/web-client/addons/web/common/nonliterals.py", line 186, in __getattr__
                raise AttributeError(name)
            AttributeError: partner_id