How To Fix /IWFND/CM_MGW536 - Function import eTag handling not supported for http method '&1'

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_MGW -

• Message number: 536

• Message text: Function import eTag handling not supported for http method '&1'

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.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message /IWFND/CM_MGW536 - Function import eTag handling not supported for http method '&1' ?

  The SAP error message /IWFND/CM_MGW536 Function import eTag handling not supported for http method '&1' typically occurs in the context of SAP Gateway services when there is an issue with the handling of eTags for specific HTTP methods. This error indicates that the function import you are trying to call does not support eTag handling for the specified HTTP method (e.g., GET, POST, PUT, DELETE).
  Cause:
  
  Unsupported HTTP Method: The function import you are trying to use may not support eTag handling for the HTTP method you are using. For example, eTags are generally used with GET requests to manage caching and concurrency.
  Configuration Issues: There may be configuration issues in the OData service or the function import definition that prevent proper handling of eTags.
  Service Implementation: The implementation of the OData service may not have been designed to handle eTags for the specific function import.
  
  Solution:
  
  Check HTTP Method: Ensure that you are using the correct HTTP method for the function import. If the function import is designed to be called with a specific method, make sure you adhere to that.
  Review Function Import Definition: Go to the SAP Gateway Service Builder (transaction code SEGW) and check the definition of the function import. Ensure that it is correctly configured and that eTag handling is supported for the intended HTTP method.
  Modify Service Implementation: If you have access to the service implementation, you may need to modify it to support eTag handling for the required HTTP method. This may involve implementing the necessary logic to handle eTags in the service code.
  Consult Documentation: Review the SAP documentation for the specific version of the Gateway you are using to understand the limitations and capabilities regarding eTag handling.
  Testing: After making changes, test the service again to ensure that the error is resolved.
  
  Related Information:
  
  eTag: An eTag (entity tag) is a part of HTTP, used for web cache validation and conditional requests from browsers for resources. It helps in managing concurrency and caching.
  OData Services: OData (Open Data Protocol) is a standard protocol for building and consuming RESTful APIs. Understanding how OData services work in SAP can help in troubleshooting issues like this.
  SAP Gateway: SAP Gateway is a technology that allows you to connect devices, environments, and platforms to SAP systems. Familiarity with its components can aid in resolving issues.
  
  If the problem persists after following these steps, consider reaching out to SAP support or consulting with a developer who has experience with SAP Gateway and OData services.