How To Fix CN814 - Activity & cannot have a relationship to itself

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 814

• Message text: Activity & cannot have a relationship to itself

What causes this issue?

You have entered a relationship for the same activity that you have
selected for maintaining relationships.

System Response

INCLUDE 'NA_ALLG_NOVERARBEITUNG' OBJECT DOKU ID TX

How to fix this error?

Enter a different activity for the relationship.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN814 - Activity & cannot have a relationship to itself ?

  The SAP error message CN814 ("Activity & cannot have a relationship to itself") typically occurs in the context of project management within SAP, particularly when dealing with network activities in Project System (PS) or when managing work breakdown structures (WBS). This error indicates that there is an attempt to create a relationship (dependency) between an activity and itself, which is not allowed.
  Cause:
  
  Self-Referencing Relationship: The most common cause of this error is that a user is trying to establish a predecessor or successor relationship where the same activity is being referenced. For example, if Activity A is set to start after Activity A, it creates a circular reference that is logically incorrect.
  
  Solution:
  
  
  Check Relationships: Review the relationships defined for the activity in question. Ensure that you are not trying to link the activity to itself. 
  
  Go to the network or activity details and check the "Relationships" tab.
  Remove any self-referencing relationships.
  
  
  
  Correct Activity Links: If you need to establish a dependency, ensure that you are linking to a different activity. 
  
  Identify the correct predecessor or successor activities and set the relationships accordingly.
  
  
  
  Review Activity Configuration: If the error persists, check the configuration of the activity itself. Ensure that all settings are correct and that there are no other underlying issues.
  
  
  Consult Documentation: If you are unsure about how to set up relationships correctly, refer to SAP documentation or user manuals related to Project System and activity management.
  
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like CN21 (Create Network), CN22 (Change Network), or CJ20N (Project Builder) to manage activities and their relationships.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Permissions: Ensure that you have the necessary permissions to modify activities and their relationships in the system.
  
  By following these steps, you should be able to resolve the CN814 error and correctly manage your project activities in SAP.