How To Fix /IWBEP/CM_V4_RUNTIME053 - Conditional read not possible without etag property

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_RUNTIME -

• Message number: 053

• Message text: Conditional read not possible without etag property

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_RUNTIME053 - Conditional read not possible without etag property ?

  The SAP error message /IWBEP/CM_V4_RUNTIME053 indicates that a conditional read operation cannot be performed because the required etag property is missing. This error typically occurs in the context of OData services when trying to perform operations that rely on the entity tag (ETag) for concurrency control.
  Cause:
  
  Missing ETag: The primary cause of this error is that the OData service is trying to perform a conditional read (like a GET request with an If-None-Match header) but the entity being accessed does not have an ETag property defined.
  Service Configuration: The OData service may not be configured to expose the ETag property, or the underlying data model does not include it.
  Data Model Issues: The data model might not be set up correctly to support ETags, or the entity might not be versioned.
  
  Solution:
  
  
  Check OData Service Configuration:
  
  Ensure that the OData service is configured to expose the ETag property. This can typically be done in the service definition or the underlying data model.
  If you are using a custom OData service, make sure that the ETag is included in the entity set.
  
  
  
  Modify the Data Model:
  
  If the data model does not include an ETag, consider adding a versioning field or a timestamp that can serve as an ETag.
  Ensure that the ETag is updated whenever the entity is modified.
  
  
  
  Update the Service Implementation:
  
  If you are developing the OData service, ensure that the implementation correctly handles ETags. This includes setting the ETag in the response headers for GET requests and checking the ETag for conditional requests.
  
  
  
  Testing:
  
  After making changes, test the OData service to ensure that the ETag is being returned correctly and that conditional reads are functioning as expected.
  
  
  
  Related Information:
  
  OData Protocol: Understanding how ETags work in the context of the OData protocol can help in troubleshooting. ETags are used for optimistic concurrency control, allowing clients to make conditional requests based on the state of the resource.
  SAP Gateway: If you are using SAP Gateway, refer to the documentation for configuring OData services and handling ETags.
  Debugging: Use tools like Postman or SAP Gateway Client to test the OData service and inspect the headers being returned to ensure that the ETag is present.
  
  By addressing the missing ETag property and ensuring that your OData service is correctly configured, you should be able to resolve the error message /IWBEP/CM_V4_RUNTIME053.