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In this scenario you have a custom entity called Training Course which has an N:N relationship with the Contact entity. It basically records each time a contact attends a training course. You need to implement a business rule that populates a field called ‘Last Training Course’ each time a contact attends a training course. The screenshot below shows the Last Training Course field on the contact entity.
The screenshot below shows the training course entity and show the many to many (N:N) relationship to the contact entity.