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Looking for best approach to build composite key in AEP when one field is missing from source data

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Hi everyone,

We’re designing schemas in Adobe Experience Platform that use a composite key (for example, Field1 + Field2) for consistency across datasets.

The challenge is that the incoming API data only contains Field1, while another dataset in AEP already holds both Field1 and Field2.
Sending everything through an external system just to attach the missing field would add unnecessary complexity and delay.

What’s the recommended way to handle this kind of scenario directly inside AEP?
Specifically, how can we enrich or complete the composite key during ingestion or processing when one part of the key is available only in another AEP dataset?

Appreciate any insights or examples from others who’ve addressed a similar schema or enrichment setup.

Thanks!

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