How To Fix SPXN026 - Idempotency only allowed for synchronous method in non-TUCC interface

SAP Error Message - Details

• Message type: E = Error

• Message class: SPXN - Proxy Generation

• Message number: 026

• Message text: Idempotency only allowed for synchronous method in non-TUCC interface

Self-Explanatory Message

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• What is the cause and solution for SAP error message SPXN026 - Idempotency only allowed for synchronous method in non-TUCC interface ?

  The SAP error message SPXN026: Idempotency only allowed for synchronous method in non-TUCC interface typically occurs in the context of SAP's integration scenarios, particularly when dealing with the SAP Process Integration (PI) or SAP Process Orchestration (PO) environments. This error is related to the handling of idempotency in service interfaces.
  Cause:
  
  Idempotency Requirement: The error indicates that the system is trying to apply idempotency (the property that allows a method to be called multiple times without changing the result beyond the initial application) to a method that is not synchronous or is part of a non-TUCC (Transactional Unit of Control) interface.
  Method Type: The method being invoked is likely defined as asynchronous, while idempotency is only applicable to synchronous methods in this context.
  Configuration Issues: There may be a misconfiguration in the service interface or the way the service is being called.
  
  Solution:
  
  Check Method Type: Ensure that the method you are trying to call is defined as synchronous if you intend to use idempotency. If it is asynchronous, you will need to either change the method to synchronous or remove the idempotency requirement.
  Review Interface Configuration: Go through the configuration of the service interface in the Enterprise Services Repository (ESR) or the Integration Directory to ensure that it is set up correctly.
  Adjust Idempotency Settings: If idempotency is not required for your use case, you can adjust the settings to disable it for the specific method or interface.
  Consult Documentation: Refer to SAP documentation for guidelines on idempotency and service interface configurations to ensure compliance with best practices.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional context or patches.
  SAP Community: Engage with the SAP Community forums or support channels to see if others have encountered similar issues and what solutions they have found.
  Testing: After making changes, thoroughly test the service to ensure that it behaves as expected without triggering the error.
  
  By following these steps, you should be able to resolve the SPXN026 error and ensure that your service interfaces are configured correctly for the intended use of idempotency.