'Rules' tab at the Attribute level

Hello - in the Logical Data Model, at the Attribute level, there is a ‘Rules’ tab, but I don’t seem to be able to add my own Rules. What is meant by ‘Rules’ here? I was thinking originally that it was a place to add Business Rules at the attribute level, but I’m not sure that it does. Can someone tell me what was intended to be captured here?

That means “Default” Rules, the functionality is similar to how domains work in TDM. Craete new Default Rule and use the Default Rule in various attributes (instead of defining the same Default Value in every single attrbute).

Regards,

Vaclav