How To Fix UR421 - Rollback only possible if the realignment run was successful

SAP Error Message - Details

• Message type: E = Error

• Message class: UR -

• Message number: 421

• Message text: Rollback only possible if the realignment run was successful

Self-Explanatory Message

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• What is the cause and solution for SAP error message UR421 - Rollback only possible if the realignment run was successful ?

  The SAP error message UR421, which states "Rollback only possible if the realignment run was successful," typically occurs in the context of the Universal Allocation (UA) process in SAP. This error indicates that a rollback operation cannot be performed because the preceding realignment run did not complete successfully. Here’s a breakdown of the cause, potential solutions, and related information:
  Cause:
  
  Unsuccessful Realignment Run: The primary cause of this error is that the realignment process, which is supposed to prepare data for allocation, has failed. This could be due to various reasons such as data inconsistencies, configuration issues, or system errors.
  Data Issues: There may be issues with the data being processed, such as missing or incorrect entries that prevent the realignment from completing successfully.
  Configuration Errors: Incorrect settings in the allocation or realignment configuration can lead to failures during the realignment run.
  System Performance: If the system is under heavy load or if there are performance issues, it may cause the realignment process to fail.
  
  Solution:
  
  Check Realignment Logs: Review the logs generated during the realignment run to identify the specific errors or warnings that occurred. This can provide insights into what went wrong.
  Data Validation: Ensure that the data being used for the realignment is complete and accurate. Check for missing or incorrect entries in the relevant master data or transactional data.
  Configuration Review: Verify the configuration settings for the allocation and realignment processes. Ensure that all necessary parameters are correctly set up.
  Re-run Realignment: After addressing any identified issues, attempt to re-run the realignment process. Ensure that it completes successfully before attempting any rollback operations.
  System Performance Check: If performance issues are suspected, consider checking system resources and performance metrics. Address any bottlenecks that may be affecting the process.
  Consult Documentation: Refer to SAP documentation or notes related to Universal Allocation and realignment processes for additional troubleshooting steps and best practices.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide patches related to the UR421 error.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as S_ALR_87012357 for allocation reports or S_ALR_87012358 for realignment logs.
  Support: If the issue persists after troubleshooting, consider reaching out to SAP support for further assistance, providing them with detailed logs and error messages.
  
  By following these steps, you should be able to identify the root cause of the UR421 error and implement a solution to resolve it.