How To Fix CN231 - Enter control key for the network activity

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 231

• Message text: Enter control key for the network activity

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CN231 - Enter control key for the network activity ?

  The SAP error message CN231 ("Enter control key for the network activity") typically occurs in the context of project management and network activities within SAP's Project System (PS) module. This error indicates that a control key, which is essential for defining how the activity is processed, has not been specified for a network activity.
  Cause:
  The error arises when:
  
  A user attempts to create or modify a network activity without specifying a control key.
  The control key is a mandatory field for the activity, and it defines the processing characteristics of the activity (e.g., whether it is a milestone, a standard activity, etc.).
  The control key may not be defined in the configuration or may not be assigned to the activity type being used.
  
  Solution:
  To resolve the CN231 error, follow these steps:
  
  
  Check Control Key Assignment:
  
  Ensure that a control key is assigned to the network activity. You can do this by navigating to the relevant network activity in the SAP GUI and checking the details.
  
  
  
  Enter Control Key:
  
  If you are creating a new activity, make sure to enter a valid control key in the appropriate field. The control key can usually be selected from a dropdown list.
  
  
  
  Review Configuration:
  
  If the control key is not available, check the configuration settings for the project system. You may need to ensure that the control keys are properly defined in the system.
  You can access the configuration settings via transaction code SPRO and navigate to:
  
  Project System > Structures > Network > Define Control Keys.
  
  
  
  
  
  Consult Documentation:
  
  If you are unsure about which control key to use, refer to your organization's documentation or consult with a project manager or SAP consultant who can provide guidance on the appropriate control key for your specific project activities.
  
  
  
  User Authorization:
  
  Ensure that you have the necessary authorizations to create or modify network activities. Lack of proper authorization can sometimes lead to incomplete data entry.
  
  
  
  Related Information:
  
  Control Keys: Control keys in SAP define how activities are processed and can include settings for scheduling, costing, and whether the activity is a milestone or a standard task.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CJ20N (Project Builder) or CN21 (Create Network) to manage project activities effectively.
  SAP Help Documentation: For more detailed information, refer to the SAP Help Portal or the specific documentation related to the Project System module.
  
  By following these steps, you should be able to resolve the CN231 error and successfully enter the required control key for your network activity.