How To Fix /IWFND/CM_MGW_RT129 - Class element ID '&1' does not exist in class '&2'

/IWFND/CM_MGW_RT129 - Overview

• Message type: E = Error

• Message class: /IWFND/CM_MGW_RT -

• Message number: 129

• Message text: Class element ID '&1' does not exist in class '&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.

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.

/IWFND/CM_MGW_RT129 - Details

• The SAP error message /IWFND/CM_MGW_RT129 Class element ID '&1' does not exist in class '&2' typically occurs in the context of SAP Gateway services, particularly when dealing with OData services. This error indicates that the system is trying to access a class element (like a property or field) that is not defined in the specified class.
  
  Cause:
  
  Missing Class Element: The specified class element ID (&1) does not exist in the class (&2). This could be due to a typo, a misconfiguration, or an incomplete implementation of the OData service.
  Changes in Data Model: If the underlying data model has changed (e.g., fields were removed or renamed), the OData service may still reference the old fields.
  Service Registration Issues: The OData service may not be properly registered or activated in the SAP Gateway.
  Versioning Issues: If there are multiple versions of the service, the wrong version might be called, leading to discrepancies in the expected