[Project] OpenERP Server Error เมื่อคลิกเปิด project จากหน้า grouped by parent

[Tep]

system: OpernERP 7.0 / Ubuntu Linux 12.04 LTS
Main Applications enabled: Sales, Project, Accounting, Human Resources, Knowledge

มีใครเคยเจอ error แบบนี้บ้างไหมครับ?

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OpenERP Server Error
Client Traceback (most recent call last):
File "/usr/lib/pymodules/python2.7/openerp/addons/web/http.py", line 204, in dispatch
response["result"] = method(self, **self.params)
File "/usr/lib/pymodules/python2.7/openerp/addons/web/controllers/main.py", line 1128, in call_kw
return self._call_kw(req, model, method, args, kwargs)
File "/usr/lib/pymodules/python2.7/openerp/addons/web/controllers/main.py", line 1120, in _call_kw
return getattr(req.session.model(model), method)(*args, **kwargs)
File "/usr/lib/pymodules/python2.7/openerp/addons/web/session.py", line 42, in proxy
result = self.proxy.execute_kw(self.session._db, self.session._uid, self.session._password, self.model, method, args, kw)
File "/usr/lib/pymodules/python2.7/openerp/addons/web/session.py", line 30, in proxy_method
result = self.session.send(self.service_name, method, *args)
File "/usr/lib/pymodules/python2.7/openerp/addons/web/session.py", line 103, in send
raise xmlrpclib.Fault(openerp.tools.ustr(e), formatted_info)

Server Traceback (most recent call last):
File "/usr/lib/pymodules/python2.7/openerp/addons/web/session.py", line 89, in send
return openerp.netsvc.dispatch_rpc(service_name, method, args)
File "/usr/lib/pymodules/python2.7/openerp/netsvc.py", line 292, in dispatch_rpc
result = ExportService.getService(service_name).dispatch(method, params)
File "/usr/lib/pymodules/python2.7/openerp/service/web_services.py", line 626, in dispatch
res = fn(db, uid, *params)
File "/usr/lib/pymodules/python2.7/openerp/osv/osv.py", line 188, in execute_kw
return self.execute(db, uid, obj, method, *args, **kw or {})
File "/usr/lib/pymodules/python2.7/openerp/osv/osv.py", line 131, in wrapper
return f(self, dbname, *args, **kwargs)
File "/usr/lib/pymodules/python2.7/openerp/osv/osv.py", line 197, in execute
res = self.execute_cr(cr, uid, obj, method, *args, **kw)
File "/usr/lib/pymodules/python2.7/openerp/osv/osv.py", line 185, in execute_cr
return getattr(object, method)(cr, uid, *args, **kw)
File "/usr/lib/pymodules/python2.7/openerp/osv/orm.py", line 2630, 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
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openerp_project_projects_grouped_by_parent.png

opernerp_project_projects_click_errormessage.png