Writing data to Observations in Cerner Sandbox environment using FHIR API gives 409 Client Error

[Muhammad Talha Asif]

Hi everyone,
I’m currently working on integrating my application with Cerner’s sandbox environment using the SMART on FHIR approach. Here’s a summary of my progress and the issue I’m encountering:
What I've Accomplished:

• Authorization: Successfully completed the authorization process using Cerner’s SMART on FHIR.
• Data Retrieval: Able to read patient data and encounter data from the SMART Launch environment provided by Cerner.

Issue Encountered: When attempting to write data to a patient's observations, I receive a 409 Conflict error. Below are the details:

Error Response:

{
  "resourceType": "OperationOutcome",
  "issue": [
    {
      "severity": "error",
      "code": "conflict",
      "details": {
        "text": "Current state of resource in conflict"
      }
    }
  ]
}

Technical Details:

• Endpoint: Observation create endpoint using a POST request.
• Documentation Reference: Observation POST Endpoint
• Payload: Using the example payload provided in the documentation for testing.
• Authorization Scopes:
  launch openid fhirUser
  user/Patient.read
  user/Patient.write
  user/Encounter.read
  user/Encounter.write
  user/Observation.read
  user/Observation.write

Questions:

• Configuration Steps: Am I missing any steps or configurations in the setup?
• Common Pitfalls: Is there a common mistake that could lead to a 409 Conflict when writing observations?
• Best Practices: Any recommendations for ensuring successful data write operations in Cerner’s sandbox environment?

Any assistance or insights on resolving this issue would be greatly appreciated.

Thank you!