However, if you want to keep modeling the older way, you can disable (deselect) the check box in Model Properties and can draw a supertype-subtype Relationship as in the screen shot below. However, if you have a model created in an older version of erwin DM with such a supertype-subtype relationship, the relationship is preserved even when you open the model into the newer version of erwin DM. With erwin DM 2018 R1, it is now enabled by default and a supertype-subtype Relationship between two different subtype Entities belonging to same or different supertype group is not allowed. It will now give you the following error which will pop up when creating a supertype-subtype Relationship between the Entities ‘Supertype2’ and ‘Subtype2’: If the check box ‘Enforce Relationship Rule’ is enabled (selected), you will not be able to add a second supertype-subtype Relationship from another supertype Entity to an existing subtype Entity.
An option to enable/disable such relationships has been provided on the Model Editor. How can I prevent an Entity from being a subtype to more than one supertype Entity?Įrwin Data Modeler DM now gives you better control over the creation of a supertype-subtype Relationship between two different subtype entities belonging to same or different supertype group. Supertype Relationships between two supertype Entities connecting to the same subtype Entity should not be allowed, but erwin allows that.
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