How To Fix /IWBEP/CM_V4_MED358 - Operation advertising property only allowed in entity or complex type

/IWBEP/CM_V4_MED358 - Overview

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 358

• Message text: Operation advertising property only allowed in entity or complex type

Self-Explanatory Message

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/IWBEP/CM_V4_MED358 - Details

• The SAP error message /IWBEP/CM_V4_MED358 indicates that there is an issue with the way an operation is being defined in an OData service. Specifically, the error states that the "operation advertising property" is only allowed in an entity or complex type. This typically occurs when you are trying to define an operation (like a function import) that is not correctly associated with an entity or complex type in your OData model.
  
  Cause:
  
  Incorrect Definition: The operation you are trying to define is not associated with a valid entity or complex type. This can happen if you are trying to define a function or action that is not properly linked to the data model.
  Model Configuration: The OData service model may not be configured correctly, leading to the system not recognizing the operation in the context of an entity or complex type.
  Service Implementation: The implementation of the service might be missing necessary annotations or