How To Fix T9491 - Conversion of table &1 no longer possible

SAP Error Message - Details

• Message type: E = Error

• Message class: T9 - Time zones/streams

• Message number: 491

• Message text: Conversion of table &1 no longer possible

What causes this issue?

Conversion is not possible since new entries have been made in the
table. This indicates that the conversion (XPRA) was started manually,
not during a release upgrade.

System Response

The conversion (XPRA) is canceled.

How to fix this error?

Check in the tables and manually in TTZ5S whether exactly one entry is
flagged as default for each country (view V_TTZ5) or country/region
(view V_TTZ5S).

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message T9491 - Conversion of table &1 no longer possible ?

  The SAP error message T9491, which states "Conversion of table &1 no longer possible," typically occurs during the process of data conversion or migration, particularly when dealing with changes in the database structure or when attempting to convert a table that has been modified or is no longer compatible with the current system configuration.
  Causes:
  
  Table Structure Changes: The structure of the table has been altered (e.g., fields added, removed, or changed) in a way that makes the conversion incompatible.
  Data Type Changes: Changes in data types of fields within the table can lead to conversion issues.
  Missing or Incompatible Data: The data in the table may not meet the requirements for conversion, such as constraints or data integrity issues.
  System Upgrade or Patch: If the system has been upgraded or patched, certain tables may no longer be supported or may require a different conversion approach.
  Custom Modifications: Custom developments or modifications to standard tables can lead to incompatibility during conversion.
  
  Solutions:
  
  Check Table Structure: Review the structure of the table in question to ensure it matches the expected format for conversion. You can use transaction SE11 (Data Dictionary) to analyze the table.
  Data Consistency Check: Run consistency checks on the data within the table to identify any issues that may prevent conversion.
  Adjust Conversion Logic: If you are using a custom program or logic for conversion, ensure that it is updated to handle the current structure and data types of the table.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide guidance on how to handle table conversions.
  Backup and Restore: If possible, back up the current state of the table and attempt to restore it to a previous version that was compatible with the conversion process.
  Contact SAP Support: If the issue persists and you cannot find a resolution, consider reaching out to SAP Support for assistance.
  
  Related Information:
  
  Transaction Codes: Use transaction codes like SE11 (Data Dictionary), SE14 (Database Utility), and SE37 (Function Builder) to analyze and manage the tables and their conversions.
  SAP Notes: Regularly check for updates and notes related to your specific SAP version, as they may contain important information regarding known issues and fixes.
  Documentation: Review SAP documentation related to data migration and conversion processes for best practices and guidelines.
  
  By following these steps, you should be able to diagnose and resolve the T9491 error effectively.