How To Fix /SAPAPO/PDEM450 - Making this change not recommended if realignment is already initialized

/SAPAPO/PDEM450 - Overview

• Message type: E = Error

• Message class: /SAPAPO/PDEM -

• Message number: 450

• Message text: Making this change not recommended if realignment is already initialized

Self-Explanatory Message

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/SAPAPO/PDEM450 - Details

• The SAP error message /SAPAPO/PDEM450 typically occurs in the context of SAP Advanced Planning and Optimization (APO), particularly when dealing with the Demand Planning (DP) module. This error indicates that a change you are trying to make is not recommended because a realignment process has already been initialized. 
  
  Cause:
  The error is triggered when:
  
  A user attempts to make changes to the planning data (like changing key figures, characteristics, or planning versions) while a realignment process is already in progress or has been initialized.
  The system is designed to prevent changes that could lead to inconsistencies or data integrity issues during the realignment process.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Realignment Status: Verify if a realignment process is currently running. You can do this by checking the background jobs in transaction SM37 or by looking at the relevant logs in the APO system.
  
  
  Wait for Completion: If a realignment is in