How To Fix /IWBEP/CM_V4_MED090 - Abstract complex type '&1' cannot inherit from complex type '&2'

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 090

• Message text: Abstract complex type '&1' cannot inherit from complex 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_MED090 - Abstract complex type '&1' cannot inherit from complex type '&2' ?

  The SAP error message /IWBEP/CM_V4_MED090 indicates that there is an issue with the inheritance of complex types in your OData service definition. Specifically, it states that an abstract complex type (denoted as &1) cannot inherit from another complex type (denoted as &2). This typically occurs in the context of defining OData services using the SAP Gateway.
  Cause:
  
  Abstract Complex Type Definition: In OData, an abstract complex type cannot be instantiated directly and is meant to be a base type for other complex types. If you attempt to have an abstract complex type inherit from a non-abstract complex type, this error will occur.
  Incorrect Inheritance Structure: The inheritance structure defined in your service might not comply with OData specifications, leading to this error.
  Model Definition Issues: There may be issues in the way the data model is defined in the service, such as incorrect annotations or relationships.
  
  Solution:
  
  Review Complex Type Definitions: Check the definitions of the complex types involved. Ensure that the abstract complex type is not incorrectly set to inherit from a non-abstract complex type.
  Adjust Inheritance: If you need to use an abstract complex type, ensure that it only inherits from other abstract types or is used as a base for other complex types that are not abstract.
  Modify the Data Model: If necessary, modify the data model in the service to correct the inheritance structure. This may involve changing the abstract status of the complex type or re-evaluating the relationships between complex types.
  Regenerate the Service: After making changes, regenerate the OData service and check if the error persists.
  
  Related Information:
  
  OData Specifications: Familiarize yourself with the OData specifications regarding complex types and inheritance. This will help you understand the limitations and requirements for defining complex types.
  SAP Gateway Documentation: Refer to the SAP Gateway documentation for guidelines on defining data models and complex types.
  Debugging Tools: Use the SAP Gateway Client or transaction /IWFND/MAINT_SERVICE to test your OData service and see if the changes resolve the issue.
  
  By following these steps, you should be able to resolve the error and ensure that your OData service is correctly defined.