How To Fix /IWBEP/CM_V4_MED351 - Etag property '&1' (in '&2') must be a STRING for CP Model

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 351

• Message text: Etag property '&1' (in '&2') must be a STRING 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_MED351 - Etag property '&1' (in '&2') must be a STRING for CP Model ?

  The SAP error message /IWBEP/CM_V4_MED351 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 STRING type, but it is not in the current context.
  Cause:
  
  Data Type Mismatch: The ETag property is expected to be of type STRING, but it is defined as a different data type (e.g., INTEGER, DECIMAL, etc.) in the underlying data model or CDS view.
  Model Configuration: The OData service or the data model may not be correctly configured to handle ETags, leading to this error.
  Service Implementation: If the OData service is implemented incorrectly, it may not be returning the ETag in the expected format.
  
  Solution:
  
  
  Check Data Model: Review the definition of the ETag property in your CDS view or data model. Ensure that it is defined as a STRING type. If it is not, modify the definition to change the data type to STRING.
  Example:
  define view ZMyView as select from my_table
  {
      key my_key,
      ...
      cast(etag_field as abap.string) as ETag
  }
  
  
  Update OData Service: If you are using an OData service, ensure that the service is correctly configured to return the ETag as a STRING. This may involve modifying the service implementation or the metadata.
  
  
  Regenerate Service: After making changes to the CDS view or data model, regenerate the OData service to ensure that the changes are reflected in the service metadata.
  
  
  Test the Service: After making the necessary changes, test the OData service to ensure that the ETag is being returned correctly and that the error no longer occurs.
  
  
  Related Information:
  
  ETag: An ETag (Entity Tag) is a mechanism used in HTTP to validate cached responses. It helps in managing concurrency and ensuring that clients are working with the latest version of a resource.
  OData Services: OData (Open Data Protocol) is a standard protocol for building and consuming RESTful APIs. It allows for querying and updating data using standard HTTP protocols.
  CDS Views: Core Data Services (CDS) are a way to define semantically rich data models in SAP. They allow for the creation of views that can be consumed by OData services.
  
  If you continue to experience issues after following these steps, consider checking the SAP community forums or consulting SAP support for further assistance.