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The attributes, Total, Taxes and OrderTotal occur once on the Order, so these attributes may be assigned to ObjectOrder.

The same is not true for the "Contact Person". This is the second Person on the Order, the first being the "Sales Rep". However, the relationship to Person is already built so we may use it to describe the relationship of a second person. Both of these people are related to Organizations, one to the company and another to the customer, so the Relation OrganizationPerson is added to the model. The Relation contains the person's "Role" or "Title" and provide contact information for these people at their respective companies.