How To Fix /IWFND/CM_GSR028 - Key was not supplied for the new list item/node.

/IWFND/CM_GSR028 - Overview

• Message type: E = Error

• Message class: /IWFND/CM_GSR -

• Message number: 028

• Message text: Key was not supplied for the new list item/node.

Self-Explanatory Message

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/IWFND/CM_GSR028 - Details

• The SAP error message /IWFND/CM_GSR028 Key was not supplied for the new list item/node typically occurs in the context of SAP Gateway and OData services. This error indicates that a required key for a new entity or list item is missing when trying to create or update data through an OData service.
  
  Cause:
  
  Missing Key Property: The entity type defined in the OData service requires a key property that is not being supplied in the request.
  Incorrect Request Format: The request payload may not be structured correctly, leading to the omission of key fields.
  Service Definition Issues: The OData service might not be properly defined, or the metadata might not be correctly configured to include the necessary key fields.
  Client-Side Issues: The client application (e.g., Fiori app, custom UI) may not be sending the required key information when making the request.
  
  
  Solution:
  
  
  Check the OData Service Metadata:
  
  Use the /IWFND/MAINT_SERVICE transaction to check the service definition and ensure