How To Fix CN023 - You cannot delete. Activity "&" has been replaced by a subnetwork

CN023 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 023

• Message text: You cannot delete. Activity "&" has been replaced by a subnetwork

What causes this issue?

Activity &V1& in the network has been replaced by a subnetwork. You
cannot delete the activity.

System Response

INCLUDE 'NA_ALLG_NOFUNKTION' OBJECT DOKU ID TX
To delete the activity, you must first delete the subnetwork
activities.

Error message extract from SAP system. Copyright SAP SE.

CN023 - Details

• The SAP error message CN023 indicates that you are trying to delete an activity in a project that has been replaced by a subnetwork. This typically occurs in the context of project management within SAP, particularly when using the Project System (PS) module.
  
  Cause:
  The error occurs because:
  
  The activity you are attempting to delete has been replaced by a subnetwork. In SAP Project System, a subnetwork is a grouping of activities that can be managed as a single entity. When a subnetwork is created, it takes over the management of the activities that were previously part of the main network.
  The system prevents the deletion of the original activity to maintain data integrity and ensure that the relationships and dependencies within the project structure are preserved.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check the Subnetwork: Verify if the activity you are trying to delete is indeed part of a subnetwork. You