Errore ordine di vendita

Traceback (most recent call last):
  File "/var/python/openerp-env/openerp-server-6.0.4/bin/netsvc.py", line 489, in dispatch
    result = ExportService.getService(service_name).dispatch(method, auth, params)
  File "/var/python/openerp-env/openerp-server-6.0.4/bin/service/web_services.py", line 599, in dispatch
    res = fn(db, uid, *params)
  File "/var/python/openerp-env/openerp-server-6.0.4/bin/osv/osv.py", line 122, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/var/python/openerp-env/openerp-server-6.0.4/bin/osv/osv.py", line 176, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/var/python/openerp-env/openerp-server-6.0.4/bin/osv/osv.py", line 167, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/var/python/openerp-env/openerp-server-6.0.4/bin/osv/orm.py", line 1602, in fields_view_get
    result['arch'] = _inherit_apply_rec(inherit_result, sql_res[3])
  File "/var/python/openerp-env/openerp-server-6.0.4/bin/osv/orm.py", line 1597, in _inherit_apply_rec
    result = _inherit_apply(result, inherit, id)
  File "/var/python/openerp-env/openerp-server-6.0.4/bin/osv/orm.py", line 1539, in _inherit_apply
    raise_view_error("Element '%s' not found in parent view '%%(parent_xml_id)s'" % tag, inherit_id)
  File "/var/python/openerp-env/openerp-server-6.0.4/bin/osv/orm.py", line 1453, in raise_view_error
    'model': self._name, })
AttributeError: View definition error for inherited view 'sale_analytic_plans.view_order_form_inherit' on 'sale.order' model: Element '<field name="project_id">' not found in parent view 'sale.view_order_form'