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# Many-to-Many Mappings and EJB

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When you use CMP, many-to-many mappings are valid only between entity beans, and cannot be privately owned. The only exception is when a many-to-many mapping is used to implement a logical one-to-many mapping with a relation table.

TopLink automatically maintains back-pointers when you create or update bidirectional relationships.

For more information, see "Configuring Bidirectional Relationship".