How To Fix /IWFND/CM_MGW_RT028 - Transformation error on deserialization

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_MGW_RT -

• Message number: 028

• Message text: Transformation error on deserialization

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_MGW_RT028 - Transformation error on deserialization ?

  The SAP error message /IWFND/CM_MGW_RT028 Transformation error on deserialization typically occurs in the context of SAP Gateway and OData services. This error indicates that there was a problem during the deserialization process, which is the conversion of data from a format (like JSON or XML) back into a structured format that the SAP system can understand.
  Causes:
  
  
  Data Format Issues: The incoming data may not match the expected format or structure defined in the OData service. This can happen if the JSON or XML payload is malformed or if it contains unexpected fields.
  
  
  Model Mismatch: The data being sent may not conform to the data model defined in the OData service. This could be due to changes in the service definition that have not been reflected in the client application.
  
  
  Type Mismatches: There may be type mismatches between the data being sent and the expected types in the OData model. For example, sending a string where a number is expected.
  
  
  Missing Required Fields: If the payload is missing required fields that are defined in the OData service, this can lead to deserialization errors.
  
  
  Service Versioning: If there are multiple versions of the OData service, the client may be calling an outdated version that does not support the current data structure.
  
  
  Solutions:
  
  
  Check Payload Structure: Validate the JSON or XML payload being sent to ensure it matches the expected structure defined in the OData service. Use tools like Postman or Fiddler to inspect the request.
  
  
  Review OData Service Definition: Check the service definition in the SAP Gateway to ensure that it matches the data being sent. Look for any changes in the data model that may not have been updated in the client application.
  
  
  Error Logs: Review the error logs in the SAP Gateway (transaction /IWFND/ERROR_LOG) to get more details about the specific deserialization error. This can provide insights into what part of the payload is causing the issue.
  
  
  Test with Sample Data: Use sample data that is known to work with the OData service to isolate whether the issue is with the data being sent or with the service itself.
  
  
  Update Client Application: If there have been changes to the OData service, ensure that the client application is updated to reflect these changes.
  
  
  Check for Required Fields: Ensure that all required fields are included in the payload. Refer to the service documentation for the list of required fields.
  
  
  Debugging: If you have access to the backend, consider debugging the OData service to see where the deserialization is failing.
  
  
  Related Information:
  
  SAP Gateway: The SAP Gateway is a technology that allows you to connect devices, environments, and platforms to SAP systems. It enables the creation of OData services.
  OData Services: OData (Open Data Protocol) is a standard protocol for building and consuming RESTful APIs. Understanding OData conventions can help in troubleshooting issues related to data formats.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as /IWFND/MAINT_SERVICE for managing OData services and /IWFND/ERROR_LOG for viewing error logs.
  
  By following these steps, you should be able to identify and resolve the cause of the /IWFND/CM_MGW_RT028 Transformation error on deserialization error in your SAP environment.