How To Fix SIG629 - External signature: Signed document was changed; no update

SAP Error Message - Details

• Message type: E = Error

• Message class: SIG - Digital Signature

• Message number: 629

• Message text: External signature: Signed document was changed; no update

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SIG629 - External signature: Signed document was changed; no update ?

  The SAP error message SIG629, which states "External signature: Signed document was changed; no update," typically occurs in the context of document management and digital signatures within SAP systems. This error indicates that a document that has been signed externally has been altered after the signature was applied, which invalidates the signature.
  Cause:
  
  
  Document Modification: The most common cause of this error is that the document has been modified after it was signed. This could happen due to:
  
  Manual changes made to the document.
  Automatic processes that update the document after it has been signed.
  System errors or bugs that inadvertently alter the document.
  
  
  
  Signature Validation: The system checks the integrity of the document against the signature. If any changes are detected, the signature is considered invalid, leading to this error message.
  
  
  Incorrect Configuration: There may be issues with the configuration of the digital signature process in SAP, which could lead to improper handling of signed documents.
  
  
  Solution:
  
  
  Revert Changes: If the document has been modified, revert it to its original state before the signature was applied. This may involve restoring a previous version of the document.
  
  
  Re-sign the Document: If changes are necessary, you will need to re-sign the document after making the required modifications. Ensure that the document is in its final state before applying the signature.
  
  
  Check Configuration: Review the configuration settings related to digital signatures in your SAP system. Ensure that the settings are correctly configured to handle signed documents.
  
  
  Audit Trail: Check the audit trail or logs to identify what changes were made to the document after it was signed. This can help in understanding the cause of the issue.
  
  
  Consult Documentation: Refer to SAP documentation or support resources for specific guidance on handling digital signatures and related error messages.
  
  
  Contact SAP Support: If the issue persists or if you are unable to identify the cause, consider reaching out to SAP support for assistance. They can provide more detailed troubleshooting steps based on your specific system configuration.
  
  
  Related Information:
  
  Digital Signatures in SAP: Understanding how digital signatures work in SAP can help in preventing such issues. Familiarize yourself with the processes involved in signing and validating documents.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide updates and patches that could resolve underlying issues.
  User Training: Ensure that users who handle signed documents are trained on the importance of maintaining document integrity and the implications of modifying signed documents.
  
  By following these steps, you should be able to address the SIG629 error and ensure that your signed documents remain valid and secure.