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R4 APIs (Millennium)

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422 Unprocessable Entity while creating DocumentReference in R4

Benson ChangDec 4 2025

Hello,

I am sometimes encountering HTTP error 422 when creating DocumentReference for R4 POST https://fhir-ehr.cerner.com/r4/00a074df-768e-479f-9c8c-52c5c5bbe010/DocumentReference

This happens intermittently only on R4 (it was not an issue on DSTU2).

Can you provide insight into what might be the root cause of this error?

Expected Result:

Success with result code 201

Actual Result:

{

"resourceType": "OperationOutcome",

"issue": [

{

"severity": "error",

"code": "invalid",

"details": {

"text": "Unprocessable entity"

}

}

]

}

x-request-id: /ED90FFBFD9199E83B2608C14D777C8E8+PxNI_8Eut

opc-request-id: /ED90FFBFD9199E83B2608C14D777C8E8/FB442BBB0B21C0F87191B9DAE1112089

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Added on Dec 4 2025
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