How To Fix /PF1/MSG_CONV_XML401 - Converter error - last unknown tag '&1'

SAP Error Message - Details

• Message type: E = Error

• Message class: /PF1/MSG_CONV_XML -

• Message number: 401

• Message text: Converter error - last unknown tag '&1'

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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Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message /PF1/MSG_CONV_XML401 - Converter error - last unknown tag '&1' ?

  The SAP error message /PF1/MSG_CONV_XML401 Converter error - last unknown tag '&1' typically indicates that there is an issue with the XML data being processed by the SAP system. This error occurs when the XML parser encounters a tag that it does not recognize or cannot process. Here’s a breakdown of the potential causes, solutions, and related information for this error:
  Causes:
  
  Malformed XML: The XML structure may be incorrect, leading to unrecognized tags.
  Unsupported Tags: The XML may contain tags that are not defined in the schema expected by the SAP system.
  Version Mismatch: The XML data might be generated by a different version of the application or system that uses different tags.
  Data Corruption: The XML data could be corrupted or improperly formatted during transmission or storage.
  Configuration Issues: There may be configuration settings in the SAP system that do not align with the XML being processed.
  
  Solutions:
  
  Validate XML Structure: Use an XML validator to check the structure of the XML data. Ensure that all tags are properly opened and closed, and that the overall structure adheres to XML standards.
  Check Tag Definitions: Review the expected XML schema or DTD (Document Type Definition) for the SAP application to ensure that all tags in the XML are recognized and defined.
  Update or Correct XML Generation: If the XML is generated by an external system, ensure that it is updated to match the expected format for the SAP system.
  Review SAP Configuration: Check the configuration settings in the SAP system to ensure that they are set up to handle the XML data being processed.
  Error Logging: Enable detailed logging in the SAP system to capture more information about the error, which can help in diagnosing the issue.
  Consult Documentation: Refer to SAP documentation or support resources for specific guidance related to the XML processing in your version of SAP.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to XML processing in your version of SAP.
  XML Schema: Familiarize yourself with the XML schema used by your SAP application to ensure compliance.
  Support Forums: Engage with SAP community forums or support channels for additional insights and solutions from other users who may have encountered similar issues.
  
  If the problem persists after trying the above solutions, it may be beneficial to reach out to SAP support for further assistance, providing them with the specific XML data and context in which the error occurs.