How To Fix CN718 - You cannot maintain key & for the constraint

CN718 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 718

• Message text: You cannot maintain key & for the constraint

What causes this issue?

The system automatically sets the key "&V1&" in capacity leveling when
the activity is dispatched. You cannot maintain this key.

System Response

INCLUDE 'NA_ALLG_NOVERARBEITUNG' OBJECT DOKU ID TX

How to fix this error?

Enter a different key for the constraint.

Error message extract from SAP system. Copyright SAP SE.

CN718 - Details

• The SAP error message CN718, which states "You cannot maintain key & for the constraint," typically occurs in the context of project management or network planning within the SAP system, particularly when dealing with constraints in project structures or network activities.
  
  Cause:
  The error usually arises due to one of the following reasons:
  
  Invalid Key: The key you are trying to maintain (e.g., a work breakdown structure (WBS) element, activity, or another identifier) is not valid for the specific constraint you are trying to set.
  Locked or Inactive Object: The object you are trying to modify may be locked or inactive, preventing any changes.
  Authorization Issues: You may not have the necessary authorizations to maintain the specified key or constraint.
  Incorrect Configuration: There may be configuration settings in the project management module that restrict the maintenance of certain keys under specific conditions.
  
  
  Solution:
  To resolve the CN718 error, you can take the following steps:
  
  Check the Key: Verify that