How To Fix /IWBEP/CM_V4_MED350 - Etag property '&1' (in '&2') must be technical for CP Model

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 350

• Message text: Etag property '&1' (in '&2') must be technical for CP Model

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_MED350 - Etag property '&1' (in '&2') must be technical for CP Model ?

  The SAP error message /IWBEP/CM_V4_MED350 indicates that there is an issue with the ETag property in the context of a Core Data Services (CDS) view or an OData service. Specifically, the error states that the ETag property must be a technical property for the Change Pointer (CP) model.
  Cause:
  The error typically arises due to the following reasons:
  
  Non-Technical ETag: The ETag property defined in your OData service is not marked as a technical property. In the context of OData services, ETags are used for concurrency control and should be defined as technical properties.
  Incorrect Configuration: The OData service or the underlying CDS view may not be configured correctly to handle ETags as required by the Change Pointer model.
  Model Definition Issues: The model definition may not align with the expectations of the OData framework, particularly regarding the handling of ETags.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check ETag Definition:
  
  Ensure that the ETag property is defined correctly in your CDS view or OData service. It should be marked as a technical property.
  In the CDS view, you can define the ETag property using the @ObjectModel: { ... } annotation to specify it as a technical property.
  
  
  
  Modify the CDS View:
  
  If you are using a CDS view, you can modify it to include the ETag as a technical property. For example:
  define view ZMy_CDS_View
  as select from my_table
  {
    key field1,
    field2,
    ...
    @ObjectModel: { ETag: true }
    field_etag
  }
  
  
  
  
  Check OData Service Configuration:
  
  Ensure that the OData service is properly configured to expose the ETag property. You may need to regenerate the service or adjust the service definition.
  
  
  
  Regenerate the OData Service:
  
  After making changes to the CDS view or the service definition, regenerate the OData service to ensure that the changes take effect.
  
  
  
  Test the Service:
  
  After making the necessary changes, test the OData service to ensure that the ETag property is being handled correctly and that the error no longer occurs.
  
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for OData services and CDS views for detailed information on defining technical properties and ETags.
  SAP Community: Engage with the SAP Community forums for insights and solutions from other users who may have encountered similar issues.
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to ETags and OData services.
  
  By following these steps, you should be able to resolve the error and ensure that your OData service functions correctly with the required ETag properties.