How To Fix /IWBEP/CM_CP168 - Instance of a complex type could not be deserialized

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_CP -

• Message number: 168

• Message text: Instance of a complex type could not be deserialized

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_CP168 - Instance of a complex type could not be deserialized ?

  The SAP error message /IWBEP/CM_CP168 Instance of a complex type could not be deserialized typically occurs in the context of SAP Gateway and OData services. This error indicates that there is an issue with the deserialization process of a complex type in the OData service response. Here are some potential causes, solutions, and related information:
  Causes:
  
  
  Mismatch in Data Structure: The structure of the data being returned from the backend does not match the expected structure defined in the OData service. This can happen if there are changes in the underlying data model that are not reflected in the OData service.
  
  
  Null or Missing Values: If the backend service returns null or missing values for fields that are expected to be present in the complex type, it can lead to deserialization issues.
  
  
  Incorrect Metadata: The metadata of the OData service may not be correctly defined or may not match the actual data being sent from the backend.
  
  
  Versioning Issues: If there are versioning issues between the OData service and the client consuming it, this can lead to deserialization errors.
  
  
  Data Type Mismatches: If the data types in the backend do not match the expected data types in the OData service, this can cause deserialization failures.
  
  
  Solutions:
  
  
  Check Data Structure: Verify that the data structure being returned from the backend matches the expected structure defined in the OData service. You may need to adjust the backend logic or update the OData service definition.
  
  
  Review Metadata: Ensure that the metadata of the OData service is correctly defined and reflects the current data model. You can regenerate the metadata if necessary.
  
  
  Handle Null Values: Implement checks in the backend to ensure that all required fields are populated before sending the response. If certain fields can be null, ensure that the OData service can handle such cases.
  
  
  Update OData Service: If there have been changes in the backend data model, update the OData service accordingly. This may involve regenerating the service or making manual adjustments.
  
  
  Debugging: Use debugging tools to trace the request and response. Check the payload being sent and received to identify any discrepancies.
  
  
  Check for Versioning Issues: Ensure that the client and server are compatible in terms of the OData service version being used.
  
  
  Related Information:
  
  SAP Gateway Logs: Check the SAP Gateway logs for more detailed error messages that can provide additional context for the issue.
  Transaction Codes: Use transaction codes like /IWFND/ERROR_LOG to view error logs related to OData services.
  SAP Notes: Search for relevant SAP Notes that may address known issues related to this error message.
  OData Documentation: Review the official SAP documentation on OData services and complex types for best practices and troubleshooting tips.
  
  By following these steps, you should be able to identify and resolve the issue causing the /IWBEP/CM_CP168 error message.