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I'm in a situation that is the following:
Company is an aggregate root and contains a list of contacts (name, phone, ..).
On another aggregate root "Contract" you are able to add something called "Participants". A participant could be a company or a contact from a company.
As far as I know, DDD doesn't allow to hold a reference in this "participation" to the ID of the contact below the company AR.
How is this solved?
It is correct that entities internal to an aggregate only have local identity. This means that multiple instances of the Aggregate can contain entities with the same Id’s. Therefor it’s not possible to reference those entities from outside the Aggregate.
This is easily solved by upgrading the entity to an Aggregate root of its own. This new AR will have a unique identity of its own and can now be referenced by multiple other aggregates.
