Can't open quants graph view

[Jitendra Prajapati(OpenERP)]

When clicking on the graph view in quant, I get the following stack trace:
OpenERP Server Error

Traceback (most recent call last):
  File "/home/odoo/runbot/static/openerp-dev-trunk-wms-28855/server/openerp/http.py", line 321, in dispatch
    response["result"] = self._call_function(**self.params)
  File "/home/odoo/runbot/static/openerp-dev-trunk-wms-28855/server/openerp/http.py", line 194, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/odoo/runbot/static/openerp-dev-trunk-wms-28855/server/openerp/service/model.py", line 112, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/odoo/runbot/static/openerp-dev-trunk-wms-28855/server/openerp/http.py", line 189, in checked_call
    return self.func(*a, **kw)
  File "/home/odoo/runbot/static/openerp-dev-trunk-wms-28855/server/openerp/addons/web/controllers/main.py", line 1109, in call_kw
    return self._call_kw(model, method, args, kwargs)
  File "/home/odoo/runbot/static/openerp-dev-trunk-wms-28855/server/openerp/addons/web/controllers/main.py", line 1101, in _call_kw
    return getattr(request.registry.get(model), method)(request.cr, request.uid, *args, **kwargs)
  File "/home/odoo/runbot/static/openerp-dev-trunk-wms-28855/server/openerp/addons/stock/stock.py", line 256, in read_group
    res = super(stock_quant, self).read_group(cr, uid, domain, fields, groupby, offset=offset, limit=limit, context=context, orderby=orderby)
  File "/home/odoo/runbot/static/openerp-dev-trunk-wms-28855/server/openerp/osv/orm.py", line 2663, in read_group
    assert groupby_def and groupby_def._classic_write, "Fields in 'groupby' must be regular database-persisted fields (no function or related fields), or function fields with store=True"
AssertionError: Fields in 'groupby' must be regular database-persisted fields (no function or related fields), or function fields with store=True

Checked on trunk-wms revision number 9527.

thanks

[qdp (OpenERP) (qdp)]

should be fixed by now (revision 9529)... but we weren't able to reproduce for an unknown reason.

Can you confirm it is fixed?

Thanks