Since 982a131026e7 access is not enforced on instances of ModelStorage. But on marketing module, users can write their own Genshi tempate which provide access to the targeted instance thus it is possible to browse data from this record without any constraint. For example a marketing scenario on sale could retrieve accounting information from the `invoices` field though the `account` on invoice line etc. Thus we should use an instance of the record that limit access to the marketing group and/or the target of the scenario (like sale group for sale etc.).