How To Fix CN453 - Meilestone number &1 can no longer be changed in &2

CN453 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 453

• Message text: Meilestone number &1 can no longer be changed in &2

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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CN453 - Details

• The SAP error message CN453 indicates that a milestone number (in this case, &1) cannot be changed in the specified object (in this case, &2). This error typically occurs in the context of project management or project systems (PS) within SAP, particularly when dealing with project milestones in a project structure.
  
  Cause:
  The error CN453 usually arises due to one of the following reasons:
  
  Milestone Status: The milestone may have already been completed or confirmed, which prevents any changes to its details.
  Project Structure: The milestone might be part of a project structure that has been locked or is in a status that does not allow changes.
  Authorization Issues: The user may not have the necessary authorizations to make changes to the milestone.
  Dependencies: There may be dependencies or relationships with other project elements that restrict changes to the milestone.
  
  
  Solution:
  To resolve the CN453 error, you can take the following steps:
  
  Check Milestone Status: Verify the status of