How To Fix /IWBEP/CM_V4_MED087 - Abstract entity type '&1' cannot inherit from entity type '&2'

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 087

• Message text: Abstract entity type '&1' cannot inherit from entity type '&2'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_MED087 - Abstract entity type '&1' cannot inherit from entity type '&2' ?

  The SAP error message /IWBEP/CM_V4_MED087 indicates that there is an issue with the inheritance of entity types in your OData service. Specifically, it states that an abstract entity type (denoted as &1) cannot inherit from a concrete entity type (denoted as &2). This is a common issue when defining entity types in the OData model.
  Cause:
  
  
  Abstract vs. Concrete Entity Types: In OData, an abstract entity type is one that cannot be instantiated directly; it is meant to be a base type for other entity types. A concrete entity type, on the other hand, can be instantiated and represents a real entity in the data model. The error occurs when you try to make an abstract entity type inherit from a concrete entity type, which is not allowed.
  
  
  Model Definition Issues: This error can arise from incorrect definitions in the OData model, such as:
  
  Incorrectly defining the abstract entity type.
  Misconfiguring the inheritance hierarchy in the metadata.
  
  
  
  Solution:
  
  
  Check Entity Type Definitions: Review the definitions of the entity types involved. Ensure that the abstract entity type is not incorrectly set to inherit from a concrete entity type. The inheritance should be structured such that:
  
  Concrete entity types can inherit from abstract entity types.
  Abstract entity types should not inherit from concrete entity types.
  
  
  
  Adjust the Inheritance Structure: If you find that the inheritance structure is incorrect, modify it accordingly:
  
  Change the abstract entity type to inherit from another abstract entity type if needed.
  Ensure that concrete entity types are inheriting from the correct abstract entity types.
  
  
  
  Regenerate the OData Service: After making changes to the entity type definitions, regenerate the OData service to ensure that the changes are reflected in the service metadata.
  
  
  Test the Changes: Once the service is regenerated, test the OData service to ensure that the error is resolved and that the entity types behave as expected.
  
  
  Related Information:
  
  OData Model Documentation: Refer to the official SAP documentation on OData services and entity type definitions for best practices and guidelines.
  SAP Notes: Check for any relevant SAP Notes that might address similar issues or provide additional insights.
  Debugging Tools: Use transaction codes like /IWFND/ERROR_LOG to check for additional error messages or logs that might provide more context on the issue.
  
  By following these steps, you should be able to resolve the error and correctly configure your OData service's entity types.