A relationship in which the to-entity type (referencing entity type) refers to the from-entity type (referenced entity type) at runtime. Conceptually, the relationship becomes an attribute of the referencing entity type. During runtime, this attribute of the referencing entity will point to a particular value (particular entity) of the associated referenced entity type. For example, in the business partner data model the entity type for a physical address does not store country information as an attribute. Instead, it has a relationship with the entity type for country. This relationship references a customizing table containing country information and acts like an attribute of physical address.
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