How To Fix /IWFND/CM_MGW091 - eTag handling not supported for this function import

/IWFND/CM_MGW091 - Overview

• Message type: E = Error

• Message class: /IWFND/CM_MGW -

• Message number: 091

• Message text: eTag handling not supported for this function import

Self-Explanatory Message

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/IWFND/CM_MGW091 - Details

• The SAP error message /IWFND/CM_MGW091 eTag handling not supported for this function import typically occurs in the context of SAP Gateway services when you are trying to use eTag handling with a function import that does not support it. Here’s a breakdown of the cause, potential solutions, and related information:
  Cause
  
  Function Import Limitation: The function import you are trying to call does not support eTag handling. eTags are used for concurrency control and caching, and not all function imports are designed to handle them.
  Service Configuration: The OData service may not be configured to handle eTags for the specific function import.
  Request Type: The request type (GET, POST, etc.) may not be appropriate for the function import you are trying to execute.
  
  Solution
  
  
  Check Function Import Definition: Review the definition of the function import in the OData service. Ensure that it is designed to support eTag handling. If it is not, you may need to