How To Fix QM_API_ODATA_MSG002 - ETag not provided (in field ChangedDateTime)

SAP Error Message - Details

• Message type: E = Error

• Message class: QM_API_ODATA_MSG - QM API OData Messages

• Message number: 002

• Message text: ETag not provided (in field ChangedDateTime)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message QM_API_ODATA_MSG002 - ETag not provided (in field ChangedDateTime) ?

  The SAP error message QM_API_ODATA_MSG002, which states "ETag not provided (in field ChangedDateTime)," typically occurs in the context of OData services when there is an issue with the handling of entity tags (ETags) during data operations, particularly updates.
  Cause:
  
  ETag Requirement: ETags are used in OData services to manage concurrency and ensure that the data being updated has not changed since it was last read. The error indicates that the ETag, which is expected in the request for the ChangedDateTime field, is missing.
  Incorrect Request Format: The request being sent to the OData service may not be formatted correctly, leading to the omission of the ETag.
  Service Configuration: The OData service may not be configured to handle ETags properly, or the entity being accessed may not support ETags.
  
  Solution:
  
  Include ETag in Request: Ensure that the request to the OData service includes the ETag for the entity being updated. This is typically done by including the If-Match header in the HTTP request, which should contain the ETag value.
  Check Entity State: Before making an update, retrieve the current state of the entity to obtain the ETag. This can usually be done with a GET request to the OData service.
  Review OData Service Documentation: Check the documentation for the specific OData service you are using to understand how ETags are managed and what the expected request format is.
  Debugging: If you have access to the backend, you can enable logging for the OData service to see the incoming requests and identify where the ETag is being omitted.
  
  Related Information:
  
  OData Protocol: Understanding the OData protocol and how it handles concurrency control with ETags can be beneficial. ETags are part of the HTTP specification and are used to manage resource state.
  SAP Notes: Check SAP Notes and Knowledge Base Articles related to the specific OData service you are using, as there may be known issues or patches available.
  SAP Community: Engaging with the SAP Community forums can provide insights from other users who may have encountered similar issues.
  
  By ensuring that the ETag is included in your requests and following the proper procedures for handling OData updates, you should be able to resolve the QM_API_ODATA_MSG002 error.