References between entities with compound key from different data stores

Support
#1

I see here (Data Stores - CUBA Platform. Developer’s Manual) that it is possible to make a reference to an entity in different datastores.

The entity that I am trying to reference has a compound key id, and it is in the datastore of an external database that I cannot modify.

Is there any way to make the reference to this entity?

Thanks.

#2

Yes, it’s supported.
The entity with compound key will have the id attribute of an embeddable type. The entity that has a reference to it will have the transient attribute of this embeddable type plus persistent attributes corresponding to all individual attributes of the compound key.

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