How To Fix CN827 - You cannot enter a new external network in change mode

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 827

• Message text: You cannot enter a new external network in change mode

What causes this issue?

You entered a network in change mode, that does not exist.

System Response

Processing ended.

How to fix this error?

Switch to add mode and enter the relationships to the external network
that you want.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN827 - You cannot enter a new external network in change mode ?

  The SAP error message CN827 ("You cannot enter a new external network in change mode") typically occurs in the context of project management or network planning within the SAP system, particularly when dealing with external networks in the Project System (PS) module.
  Cause:
  This error arises when a user attempts to create or modify an external network while in change mode. In SAP, external networks are typically predefined and cannot be altered or added to in change mode. The system restricts this action to maintain data integrity and consistency.
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check the Mode: Ensure that you are in the correct mode for the action you want to perform. If you need to create a new external network, you should be in the "create" mode rather than "change" mode.
  
  
  Use the Correct Transaction: If you are trying to create a new external network, make sure you are using the appropriate transaction code (e.g., CN21 for creating networks) instead of a transaction that is meant for changing existing networks.
  
  
  Review Authorizations: Ensure that you have the necessary authorizations to create or modify external networks. Lack of proper permissions can sometimes lead to unexpected behavior.
  
  
  Consult Documentation: Refer to SAP documentation or help files for specific instructions on how to manage external networks. This can provide insights into the correct procedures and any limitations.
  
  
  Contact Support: If you continue to face issues, consider reaching out to your SAP support team or consulting with an SAP expert who can provide guidance based on your specific system configuration.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CN21 (Create Network) and CN22 (Change Network).
  SAP Notes: Check for any SAP Notes related to this error message, as they may provide additional context or solutions.
  User Roles: Review user roles and profiles to ensure that they are set up correctly for the tasks you are trying to perform.
  
  By following these steps, you should be able to address the CN827 error and proceed with your work in the SAP system.