How To Fix CN871 - Standard network & for this key date does not exist

CN871 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 871

• Message text: Standard network & for this key date does not exist

What causes this issue?

There are no alternatives for the standard network for the key date you
entered.
Either the alternative
has a key date in the future or
was marked for deletion

System Response

INCLUDE 'NA_ALLG_NOVERARBEITUNG' OBJECT DOKU ID TX

How to fix this error?

You can check whether alternatives exist for the standard network.
Enter a date for the key date that lies very far in the future.
If you do not find any alternatives, you can assume that the
alternative for the standard network was marked for deletion.
The key or the number of the alternative is protected until it is
deleted during data base reorganization.

Error message extract from SAP system. Copyright SAP SE.

CN871 - Details

• The SAP error message CN871 typically indicates that there is an issue with the standard network for a specific key date in the project system. This error can occur in various scenarios, particularly when dealing with project networks, scheduling, or planning activities.
  
  Cause:
  The error message CN871 usually arises due to one of the following reasons:
  
  
  Missing Standard Network: The standard network for the specified key date does not exist in the system. This could happen if the network was not created or if it was deleted.
  
  
  Incorrect Key Date: The key date specified in the transaction may not correspond to any existing standard network. This can occur if the date is outside the range of valid dates for the network.
  
  
  
  Configuration Issues: There may be configuration issues in the project system settings that prevent the standard network from being recognized.
  
  
  Authorization Issues: The user may not have the necessary authorizations to access the standard network.
  
  
  
  Solution:
  To