How To Fix WSS043 - Sign: wsu:Id attribute is missing, signing not possible

SAP Error Message - Details

• Message type: E = Error

• Message class: WSS - Web Services Security

• Message number: 043

• Message text: Sign: wsu:Id attribute is missing, signing not possible

Self-Explanatory Message

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• What is the cause and solution for SAP error message WSS043 - Sign: wsu:Id attribute is missing, signing not possible ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WSS043 Sign: wsu:Id attribute is missing, signing not possible
  
  Cause:
  This error occurs during the processing of SOAP messages secured with WS-Security in SAP PI/PO or other SAP Web Services components. Specifically, the error indicates that the XML element that needs to be signed does not have the required wsu:Id attribute.
  
  The wsu:Id attribute is part of the WS-Security specification and is used to uniquely identify XML elements for signing and referencing.
  Without this attribute, the signing engine cannot locate the element to apply the digital signature.
  This usually happens if the incoming or outgoing SOAP message is missing the wsu:Id attribute on the element that needs to be signed, or if the message structure does not conform to WS-Security standards.
  
  
  When does it typically occur?
  
  When SAP PI/PO or SAP Web Service client/server tries to sign a SOAP message.
  When the WS-Security configuration expects a wsu:Id attribute on the element to be signed but it is missing.
  When the sender or receiver system does not add the wsu:Id attribute properly.
  When custom adapters or mappings manipulate the SOAP message and remove or fail to add the wsu:Id.
  
  
  Solution:
  
  
  Ensure wsu:Id attribute is present:
  
  Check the SOAP message structure and verify that the element to be signed contains the wsu:Id attribute.
  The attribute should be in the namespace http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd (usually prefix wsu).
  
  
  
  Adjust WS-Security configuration:
  
  In SAP PI/PO, check the WS-Security profile configuration.
  Make sure the signing configuration points to the correct XML element that contains the wsu:Id.
  If the element does not have wsu:Id, either modify the sender system to add it or adjust the signing configuration to sign an element that has the attribute.
  
  
  
  Modify the message or mapping:
  
  If you control the message generation, add the wsu:Id attribute to the element that needs to be signed.
  If using custom mappings or adapter modules, ensure they do not remove or alter the wsu:Id attribute.
  
  
  
  Use SAP Notes and documentation:
  
  Check SAP Notes related to WS-Security and signing issues.
  For example, SAP Note 1789271 and others related to WS-Security might provide additional hints.
  
  
  
  
  Related Information:
  
  WS-Security specification: The wsu:Id attribute is mandatory for elements that are referenced in the signature.
  SAP PI/PO WS-Security: The signing engine relies on this attribute to locate the element to sign.
  Namespace: The wsu prefix must be correctly declared in the SOAP message.
  Debugging: Use SOAP message trace tools (e.g., SOAP UI, SAP PI message monitoring) to inspect the message.
  SAP Community and Support: Search for similar issues in SAP forums and OSS notes.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Cause
  Missing wsu:Id attribute on the XML element to be signed in the SOAP message.
  
  
  Effect
  Signing process fails because the element cannot be identified for signature application.
  
  
  Solution
  Add the wsu:Id attribute to the element, adjust WS-Security config, or fix message generation.
  
  
  Related Info
  WS-Security spec, SAP Notes, message tracing, correct namespace declarations.
  
  
  
  
  If you provide the SOAP message or configuration details, I can help you identify exactly where the wsu:Id is missing and how to add it.