How To Fix /IWFND/CM_EXTENSION002 - An object ID has to be specified; it may only be omitted in CUD calls

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_EXTENSION -

• Message number: 002

• Message text: An object ID has to be specified; it may only be omitted in CUD calls

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWFND/CM_EXTENSION002 - An object ID has to be specified; it may only be omitted in CUD calls ?

  The SAP error message /IWFND/CM_EXTENSION002 typically occurs in the context of OData services when an object ID is expected but not provided. This error is common when working with the SAP Gateway and OData services, particularly during read (GET) operations or when trying to access specific entities.
  Cause:
  The error message indicates that the system expects an object ID to be specified in the request, but it was omitted. This usually happens in the following scenarios:
  
  Missing Object ID: The request is trying to access a specific entity (e.g., a specific record in a database table) without providing the necessary identifier (ID).
  Incorrect HTTP Method: The request method used may not be appropriate for the operation being performed. For example, using a GET request without specifying an ID when the service expects one.
  Service Configuration: The OData service might be incorrectly configured, leading to the expectation of an object ID where it shouldn't be.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check the Request URL: Ensure that the request URL includes the necessary object ID. For example, if you are trying to access a specific entity, the URL should look something like /EntitySet('ObjectID').
  
  
  Verify HTTP Method: Make sure you are using the correct HTTP method for the operation. For example:
  
  Use GET for retrieving data (with an ID if required).
  Use POST for creating new records (object ID is not needed).
  Use PUT or PATCH for updating existing records (object ID is required).
  
  
  
  Review OData Service Implementation: If you are developing or maintaining the OData service, check the implementation to ensure that the service is correctly set up to handle requests. Make sure that the entity sets and their keys are properly defined.
  
  
  Test with Different Scenarios: If you are unsure about the expected input, try testing the service with different scenarios, including valid and invalid object IDs, to see how the service responds.
  
  
  Check Service Metadata: Review the service metadata (usually accessible via the $metadata endpoint) to understand the expected structure of the requests and the required parameters.
  
  
  Related Information:
  
  SAP Gateway: The SAP Gateway is a technology that allows you to connect devices, environments, and platforms to SAP systems. Understanding how it works can help in troubleshooting issues related to OData services.
  OData Protocol: Familiarize yourself with the OData protocol, which defines how to create and consume RESTful APIs. Understanding the conventions around entity IDs and operations can help prevent such errors.
  SAP Notes and Documentation: Check SAP Notes and official documentation for any known issues or updates related to the specific version of SAP you are using.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.