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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN871 - Standard network & for this key date does not exist ?

  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 resolve the CN871 error, you can take the following steps:
  
  
  Check Standard Network:
  
  Verify if the standard network exists for the specified key date. You can do this by navigating to the relevant transaction (e.g., CN21 for creating networks) and checking the network details.
  
  
  
  Adjust Key Date:
  
  Ensure that the key date you are using is correct and falls within the valid range of dates for the standard network. If necessary, adjust the key date to match an existing network.
  
  
  
  Create or Restore Standard Network:
  
  If the standard network does not exist, you may need to create it. Use transaction CN21 to create a new standard network or restore it if it was deleted.
  
  
  
  Check Configuration:
  
  Review the configuration settings in the project system to ensure that everything is set up correctly. This may involve checking the project profile and network settings.
  
  
  
  Authorization Check:
  
  Ensure that the user has the necessary authorizations to access and modify the standard network. You may need to consult with your SAP security team to verify this.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for additional guidance on handling project networks and related errors.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CN21 (Create Standard Network), CN22 (Change Standard Network), and CN23 (Display Standard Network).
  SAP Notes: Check for any SAP Notes related to error CN871 for specific patches or updates that may address known issues.
  User Forums: Consider visiting SAP community forums or user groups for additional insights and solutions shared by other users who may have encountered the same error.
  
  By following these steps, you should be able to identify the cause of the CN871 error and implement a suitable solution.