/CPD/SS_MESSAGES391 - Cannot process multiple PATCH requests in a single changeset.

SAP Error Message - Details

• Message type: E = Error

• Message class: /CPD/SS_MESSAGES -

• Message number: 391

• Message text: Cannot process multiple PATCH requests in a single changeset.

Self-Explanatory Message

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AnswerBot

• What is the cause and solution for SAP error message /CPD/SS_MESSAGES391 - Cannot process multiple PATCH requests in a single changeset. ?

  The error message /CPD/SS_MESSAGES391 Cannot process multiple PATCH requests in a single changeset in SAP typically occurs when you are trying to send multiple PATCH requests within a single changeset in an OData service. This is not allowed as per the OData protocol specifications, which dictate that each changeset can only contain one PATCH request.
  Cause:
  
  Multiple PATCH Requests: The primary cause of this error is that the client is attempting to send multiple PATCH requests in a single transaction or changeset.
  Incorrect Client Implementation: The client application may not be correctly implementing the OData protocol, leading to the bundling of multiple PATCH requests.
  Service Configuration: The OData service may not be configured to handle multiple requests in a single changeset.
  
  Solution:
  
  Separate PATCH Requests: Modify the client application to send each PATCH request separately rather than bundling them into a single changeset. Each PATCH request should be sent as an individual HTTP request.
  Review Client Code: Check the client-side code to ensure that it adheres to the OData specifications. Ensure that the requests are being constructed correctly.
  Service Configuration: If you have control over the OData service, ensure that it is configured correctly to handle requests as expected. However, note that the OData protocol itself does not support multiple PATCH requests in a single changeset, so this is more about ensuring compliance with the protocol.
  Error Handling: Implement error handling in the client application to catch and manage such errors gracefully.
  
  Related Information:
  
  OData Protocol: Familiarize yourself with the OData protocol specifications, particularly regarding how changesets and requests are structured.
  SAP Documentation: Refer to SAP's official documentation for OData services to understand the expected behavior and best practices.
  Debugging Tools: Use tools like Postman or Fiddler to inspect the requests being sent to the OData service and ensure they conform to the expected format.
  
  By following these steps, you should be able to resolve the error and ensure that your application interacts correctly with the SAP OData service.