How To Fix /IWFND/CM_MGW_RT027 - Operation '&1' not supported for entity type '&2'

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_MGW_RT -

• Message number: 027

• Message text: Operation '&1' not supported for entity type '&2'

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWFND/CM_MGW_RT027 - Operation '&1' not supported for entity type '&2' ?

  The SAP error message /IWFND/CM_MGW_RT027 indicates that an operation (like GET, POST, PUT, DELETE) is not supported for a specific entity type in the context of an OData service. This error typically arises when the OData service is trying to perform an operation that is not defined for the specified entity type in the service's metadata.
  Cause:
  
  
  Unsupported Operation: The operation you are trying to perform (e.g., creating, updating, or deleting an entity) is not supported for the specified entity type. This could be due to the entity type being read-only or not having the necessary CRUD (Create, Read, Update, Delete) operations defined.
  
  
  Service Definition: The OData service might not have the operation defined in its service metadata. This can happen if the service was not properly configured or if the entity type was not designed to support the operation.
  
  
  Authorization Issues: Sometimes, the user might not have the necessary authorizations to perform the operation, leading to the appearance that the operation is unsupported.
  
  
  Incorrect URL or Request: The request might be incorrectly formed, leading to the system not recognizing the operation for the entity type.
  
  
  Solution:
  
  
  Check Service Metadata: Review the OData service metadata (usually accessible via the $metadata endpoint) to confirm which operations are supported for the entity type in question. Ensure that the operation you are trying to perform is listed.
  
  
  Modify Service Definition: If the operation is indeed not supported and you need it to be, you may need to modify the OData service definition in the backend (e.g., using SEGW transaction in SAP Gateway) to include the necessary operations.
  
  
  Review Authorization: Ensure that the user has the necessary authorizations to perform the operation. Check the roles and authorizations assigned to the user.
  
  
  Correct Request Format: Verify that the request is correctly formatted and that you are using the correct HTTP method (GET, POST, PUT, DELETE) for the operation you intend to perform.
  
  
  Debugging: If you have access to the backend, you can debug the OData service to see how it processes the request and where it fails.
  
  
  Related Information:
  
  OData Service Development: Familiarize yourself with the OData service development process in SAP, including how to define entity types and operations in the SAP Gateway.
  SAP Notes: Check for any relevant SAP Notes that might address known issues or provide additional guidance on this error.
  Community Forums: Engage with SAP community forums or support channels for additional insights or similar cases encountered by other users.
  
  By following these steps, you should be able to identify the root cause of the error and implement a suitable solution.