How To Fix CN123 - Specified assignment to network does not exist

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 123

• Message text: Specified assignment to network does not exist

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CN123 - Specified assignment to network does not exist ?

  The SAP error message CN123 ("Specified assignment to network does not exist") typically occurs in the context of project management and network planning within SAP. This error indicates that the system cannot find the specified assignment of a network activity to a project or a work breakdown structure (WBS) element.
  Causes:
  
  Incorrect Network Assignment: The network activity you are trying to reference may not be correctly assigned to the project or WBS element.
  Deleted or Inactive Network: The network or activity you are trying to access may have been deleted or is currently inactive.
  Data Inconsistency: There may be inconsistencies in the data, such as missing or incorrect entries in the database.
  Authorization Issues: The user may not have the necessary authorizations to view or modify the network assignment.
  Incorrect Configuration: There may be configuration issues in the project system settings that prevent the assignment from being recognized.
  
  Solutions:
  
  
  Verify Network Assignment:
  
  Check the network and activity assignments in the project system. Ensure that the network is correctly assigned to the project or WBS element.
  Use transaction codes like CN21 (Create Network) or CN22 (Change Network) to review the network details.
  
  
  
  Check for Deletions:
  
  Confirm that the network or activity has not been deleted. If it has been deleted, you may need to recreate it or adjust your references accordingly.
  
  
  
  Data Consistency Check:
  
  Run consistency checks in the project system to identify and resolve any data inconsistencies. You can use transaction CJEN (Project Structure: Check Consistency) for this purpose.
  
  
  
  Authorization Check:
  
  Ensure that the user has the necessary authorizations to access and modify the network assignments. Check the user roles and authorizations in the SAP system.
  
  
  
  Configuration Review:
  
  Review the configuration settings in the project system to ensure that they are set up correctly. This may involve checking the project profile and network profile settings.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for additional guidance on handling network assignments and related error messages.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CJ20N (Project Builder), CN41 (Network Overview), and CJ03 (Display Project) for managing projects and networks.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. You can search for specific notes in the SAP Support Portal.
  User Forums: Engage with SAP community forums or user groups for insights and solutions shared by other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify the cause of the CN123 error and implement the appropriate solution.