How To Fix /IWBEP/CM_V4_MED066 - Type '&1' not allowed for key properties

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 066

• Message text: Type '&1' not allowed for key properties

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_MED066 - Type '&1' not allowed for key properties ?

  The SAP error message /IWBEP/CM_V4_MED066 Type '&1' not allowed for key properties typically occurs in the context of OData services when there is an issue with the definition of key properties in your OData model. This error indicates that the type of a property that is being used as a key is not valid or not supported.
  Cause:
  
  Invalid Data Type: The property defined as a key in your OData service may have a data type that is not allowed for key properties. For example, certain complex types or unsupported primitive types cannot be used as keys.
  Model Definition Issues: There may be inconsistencies or errors in the way the OData model is defined, particularly in the metadata where the entity types and their properties are specified.
  Key Property Configuration: The key properties may not be correctly configured in the service definition, leading to this error when the service is accessed.
  
  Solution:
  
  Check Data Types: Review the data types of the properties defined as keys in your OData model. Ensure that they are of a supported type (e.g., Edm.String, Edm.Int32, Edm.Guid, etc.) and not complex types or unsupported types.
  Update the Model: If you find that the key properties are incorrectly defined, update the OData model to use valid types for the key properties. This may involve modifying the ABAP code or the service definition in the SAP Gateway.
  Regenerate the Service: After making changes to the model, regenerate the OData service and its metadata. This can often resolve issues related to outdated or incorrect metadata.
  Check Service Implementation: Ensure that the implementation of the OData service correctly adheres to the defined model, especially in the methods that handle CRUD operations.
  Test the Service: After making the necessary changes, test the OData service to ensure that the error is resolved and that the service behaves as expected.
  
  Related Information:
  
  OData Specification: Familiarize yourself with the OData protocol and its specifications regarding entity keys and data types.
  SAP Gateway Documentation: Review the SAP Gateway documentation for guidelines on defining OData services and key properties.
  Debugging Tools: Use transaction codes like /IWFND/ERROR_LOG to check for additional error messages or logs that may provide more context about the issue.
  Community Forums: Consider checking SAP Community forums or other developer communities for similar issues and solutions shared by other developers.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.