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

UR421 - Overview

• Message type: E = Error

• Message class: UR -

• Message number: 421

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

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.

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UR421 - Details

• 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