How To Fix SRT_WSP526 - Invalid number of "MEP" attributes in operation "&1{&2}"

SAP Error Message - Details

• Message type: E = Error

• Message class: SRT_WSP - Messages for SRT WSP

• Message number: 526

• Message text: Invalid number of "MEP" attributes in operation "&1{&2}"

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SRT_WSP526 - Invalid number of "MEP" attributes in operation "&1{&2}" ?

  The SAP error message SRT_WSP526 indicates that there is an issue with the number of "Message Exchange Pattern" (MEP) attributes defined for a specific operation in a web service. This error typically arises in the context of SAP Process Integration (PI) or SAP Process Orchestration (PO) when dealing with web services.
  Cause:
  The error occurs when the number of MEP attributes defined for an operation does not match the expected configuration. This can happen due to:
  
  Incorrect Configuration: The web service operation may have been incorrectly configured in the Enterprise Services Repository (ESR) or in the Service Definition.
  Mismatch in WSDL: The WSDL (Web Services Description Language) file may not correctly define the expected MEP attributes for the operation.
  Changes in Service Definition: If there have been recent changes to the service definition or the underlying data model, it may lead to inconsistencies.
  Versioning Issues: If there are multiple versions of the service, the client may be calling an outdated version that does not match the current server configuration.
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Check Configuration: Review the configuration of the web service operation in the ESR. Ensure that the MEP attributes are correctly defined according to the service requirements.
  
  
  Validate WSDL: If you are using a WSDL file, validate it to ensure that it correctly defines the MEP attributes. You can use tools like SOAP UI to test the WSDL and see if it matches the expected structure.
  
  
  Update Service Definition: If there have been changes to the service definition, ensure that all relevant components (like mappings, interfaces, etc.) are updated accordingly.
  
  
  Check for Version Conflicts: Ensure that the client is calling the correct version of the service. If there are multiple versions, make sure the client is updated to use the latest version.
  
  
  Test with Different Clients: If possible, test the web service with different clients to see if the issue persists. This can help identify if the problem is client-specific.
  
  
  Review Logs: Check the SAP application logs (transaction SLG1) for more detailed error messages that might provide additional context about the issue.
  
  
  Consult Documentation: Refer to SAP documentation or community forums for any known issues or patches related to this error.
  
  
  Related Information:
  
  Message Exchange Patterns (MEP): Understand the different types of MEPs (e.g., Request-Response, One-Way) and how they are defined in your service.
  SAP PI/PO Documentation: Review the official SAP documentation for guidance on configuring web services and troubleshooting common errors.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify and resolve the cause of the SRT_WSP526 error in your SAP environment.