timesheet_task : Crash when adding timesheet lines on a task

With the module timesheet_task, go to the form view of a task and try to add timesheet lines : it often crashes with this error message :

2014-03-26 08:37:02,754 2695 ERROR erpv70_aven1 openerp.sql_db: Programming error: column "task_id" does not exist
LINE 1: ...lect 1 from hr_analytic_timesheet where id=18 and task_id=11
                                                             ^
, in query select 1 from hr_analytic_timesheet where id=%s and task_id=%s
2014-03-26 08:37:02,755 2695 ERROR erpv70_aven1 openerp.osv.osv: Uncaught exception
Traceback (most recent call last):
  File "/home/alexis/new_boite/dev/server-70/openerp/osv/osv.py", line 132, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/home/alexis/new_boite/dev/server-70/openerp/osv/osv.py", line 199, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/home/alexis/new_boite/dev/server-70/openerp/osv/osv.py", line 187, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/home/alexis/new_boite/dev/hr-timesheet/timesheet_task/project_task.py", line 96, in write
    res = super(ProjectTask, self).write(cr, uid, ids, vals, context=context)
  File "/home/alexis/new_boite/dev/addons-70/project/project.py", line 1202, in write
    result = super(task, self).write(cr, uid, ids, vals, context=context)
  File "/home/alexis/new_boite/dev/addons-70/mail/mail_thread.py", line 290, in write
    result = super(mail_thread, self).write(cr, uid, ids, values, context=context)
  File "/home/alexis/new_boite/dev/server-70/openerp/osv/orm.py", line 4234, in write
    result += self._columns[field].set(cr, self, id, field, vals[field], user, context=rel_context) or []
  File "/home/alexis/new_boite/dev/server-70/openerp/osv/fields.py", line 574, in set
    cr.execute("select 1 from {0} where id=%s and {1}=%s".format(_table, self._fields_id), (act[1], id))
  File "/home/alexis/new_boite/dev/server-70/openerp/sql_db.py", line 161, in wrapper
    return f(self, *args, **kwargs)
  File "/home/alexis/new_boite/dev/server-70/openerp/sql_db.py", line 226, in execute
    res = self._obj.execute(query, params)
ProgrammingError: column "task_id" does not exist
LINE 1: ...lect 1 from hr_analytic_timesheet where id=18 and task_id=11
                                                             ^

This crash is not systematic, but it happens very often. I noticed that usually it works for the first timesheet line that you create+save, but it crashes on the next one that you create+save.

There is no field task_id on hr_analytic_timesheet, because hr.analytic.timesheet inherits from account.analytic.line and the field task_id is on account.analytic.line. But OpenERP's ORM tries to read the field 'task_id' on hr_analytic_timesheet instead of account_analytic_line, which make it crash.