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Standard Links can be defined with an additional attribute that's not part of any business key attributes of a Hub, but define the business relationship.
But also using the same technique, define Links as Non-Historized Links or sometimes known as Transactional Links, which is a Link that is not updateable and the additional attribute is the transaction identifier.

  1. Supplements an entity that is designed solely as a Link (Entity should not be generating a Hub as well).
  2. Add an additional source attribute.
  3. Set the attribute type on the attributes as "Link dependent child".

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