A relationship must be turned into an associative entity when the associative entity has other relationships with entities besides the relationship that caused its creation.

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An associative entity is created to represent a many-to-many relationship between two entities, but if it has other relationships with entities besides the one that caused its creation, it must be turned into an associative entity. This is because it becomes an entity in itself, rather than just a link between two other entities.

A Relationship Must Be Turned into an Associative Entity When