How To Fix /IWBEP/CM_V4_MED381 - ETag property for stream prop. '&1' in entity type '&2' not set

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 381

• Message text: ETag property for stream prop. '&1' in entity type '&2' not set

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_MED381 - ETag property for stream prop. '&1' in entity type '&2' not set ?

  The SAP error message /IWBEP/CM_V4_MED381 indicates that there is an issue with the ETag property for a stream property in an OData service. This error typically arises when the ETag (Entity Tag) is not set for a specific stream property in the entity type being accessed. ETags are used in OData to manage concurrency and caching, ensuring that clients are working with the most recent version of the data.
  Cause:
  
  Missing ETag Configuration: The ETag property for the specified stream property is not configured or is missing in the metadata of the OData service.
  Incorrect Entity Type Definition: The entity type may not be correctly defined to include the ETag for the stream property.
  Service Implementation Issues: There may be issues in the implementation of the OData service that prevent the ETag from being generated or returned.
  
  Solution:
  
  
  Check Metadata: Verify the metadata of the OData service to ensure that the ETag property is defined for the stream property in question. You can do this by accessing the service's metadata URL (usually ending in $metadata).
  
  
  Update Entity Type Definition: If the ETag is not defined, you may need to update the entity type definition in your service implementation to include the ETag for the stream property.
  
  
  Implement ETag Logic: Ensure that your service implementation correctly generates and returns the ETag for the stream property. This may involve modifying the backend logic to set the ETag based on the content of the stream.
  
  
  Check Service Configuration: Review the service configuration settings to ensure that ETags are enabled and properly configured.
  
  
  Testing: After making the necessary changes, test the OData service again to ensure that the ETag is now being set correctly.
  
  
  Related Information:
  
  OData Protocol: Understanding the OData protocol and how ETags are used for concurrency control can help in troubleshooting similar issues.
  SAP Gateway: If you are using SAP Gateway, refer to the documentation for configuring OData services and handling stream properties.
  SAP Notes: Check for any relevant SAP Notes or documentation that may address known issues or provide additional guidance on handling ETags in OData services.
  
  If the issue persists after following these steps, consider reaching out to SAP support or consulting the SAP community for further assistance.