The history was not being updated properly, we think this is because the declaritive attribute is not being set propery by the property.
When reply_to: None it will update the service_letter_contact_id, but not the service_letter_contact, we think when the history_meta is build the history class and checking if the value is updated it depends which attribute it is checking first.
In order to fix this issue, there is a new dao method to update the reply_to on the Template and insert a new Template history.