How To Fix /IWBEP/CM_V4_MED189 - Complex type '&1' already has etag property '&2'

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 189

• Message text: Complex type '&1' already has etag property '&2'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_MED189 - Complex type '&1' already has etag property '&2' ?

  The SAP error message /IWBEP/CM_V4_MED189 indicates that there is an issue with the definition of a complex type in your OData service. Specifically, it states that the complex type you are trying to define already has an ETag property defined, which is causing a conflict.
  Cause:
  
  Duplicate ETag Definition: The error typically arises when you attempt to define an ETag property for a complex type that already has one defined. In OData services, ETags are used for concurrency control, and each entity or complex type can have only one ETag property.
  Model Definition Issues: This can also occur if there are inconsistencies or errors in the metadata definition of your OData service, particularly in the way complex types are structured.
  
  Solution:
  
  Check Complex Type Definition: Review the definition of the complex type in your OData service. Ensure that you are not defining the ETag property more than once. If you find multiple definitions, remove the redundant ones.
  Update Metadata: If you have made changes to the complex type definition, ensure that you regenerate or update the metadata for your OData service to reflect these changes.
  Review Service Implementation: If you are implementing the OData service programmatically, check the code to ensure that the ETag property is only being added once.
  Test with a Simple Model: If the issue persists, try simplifying your model to isolate the problem. Create a basic version of the complex type without the ETag and see if the error still occurs.
  
  Related Information:
  
  OData Version: Ensure that you are following the correct OData version specifications, as different versions may have different rules regarding ETags and complex types.
  SAP Notes: Check SAP Notes and documentation for any known issues or updates related to this error message. SAP frequently updates its knowledge base with solutions to common problems.
  Debugging Tools: Utilize debugging tools available in SAP to trace the execution and identify where the complex type is being defined or modified.
  
  By following these steps, you should be able to resolve the error and ensure that your OData service functions correctly.