How To Fix CN366 - You can not execute milestone functions in the background (&1)

CN366 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 366

• Message text: You can not execute milestone functions in the background (&1)

What causes this issue?

Milestone functions were found when you confirmed activities and
activity elements in background processing (using BAPI, CATS).
In order to carry out milestone functions, you must process in the
dialog.

System Response

The system does not carry out the milestone function.

How to fix this error?

Carry out the function manually, if necessary.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

CN366 - Details

• The SAP error message CN366 indicates that you cannot execute milestone functions in the background for a particular operation or task. This error typically arises in the context of project management or network planning within SAP, particularly when dealing with milestones in project systems (PS) or related modules.
  
  Cause:
  The error occurs because milestone functions are designed to be executed in a dialog mode rather than in the background. This is due to the nature of milestones, which often require user interaction or real-time updates that cannot be effectively handled in a background processing environment.
  
  Solution:
  To resolve the CN366 error, consider the following steps:
  
  
  Run in Dialog Mode: Ensure that the transaction or function you are trying to execute is run in dialog mode rather than in the background. This may involve changing the way you initiate the process.
  
  
  Check Job Scheduling: If you are trying to schedule a job that includes milestone functions, review