How To Fix CN801 - Activity "&" does not exist in network "&"

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 801

• Message text: Activity "&" does not exist in network "&"

What causes this issue?

You have maintained a relationship for an activity that does not exist
in this network.

System Response

INCLUDE 'NA_ALLG_NOVERARBEITUNG' OBJECT DOKU ID TX

How to fix this error?

INCLUDE 'NA_ALLG_URSACHEN' OBJECT DOKU ID TX
RESET N1
Check that you have entered the correct key for the activity.
Make sure that the activity, whose key you have entered, really does
exist.
Enter another key for the activity.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN801 - Activity "&" does not exist in network "&" ?

  The SAP error message CN801 indicates that the system is unable to find a specific activity in a network. This typically occurs in the context of project management and network planning within SAP, particularly in modules like SAP PS (Project System).
  Cause:
  The error message CN801 can be triggered by several factors:
  
  Non-existent Activity: The activity specified in the error message does not exist in the network. This could be due to a typo in the activity number or the activity being deleted or not created yet.
  Network Not Active: The network itself may not be active or may have been deleted.
  Authorization Issues: The user may not have the necessary authorizations to view or access the specified activity or network.
  Data Inconsistency: There may be inconsistencies in the data, such as missing entries in the database.
  
  Solution:
  To resolve the CN801 error, you can take the following steps:
  
  
  Verify Activity and Network:
  
  Check if the activity number and network number are correct. Ensure that they exist in the system.
  Use transaction codes like CN21 (Create Network) or CN22 (Change Network) to verify the existence of the network and its activities.
  
  
  
  Check Network Status:
  
  Ensure that the network is active. If it is not, you may need to activate it using transaction CN22.
  
  
  
  Review Authorizations:
  
  Check if the user has the necessary authorizations to access the network and its activities. You may need to consult with your SAP security team.
  
  
  
  Data Consistency Check:
  
  Run consistency checks to ensure that there are no data inconsistencies. You can use transaction CNO1 (Check Network) to perform this check.
  
  
  
  Recreate Activity:
  
  If the activity was deleted or is missing, you may need to recreate it in the network.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help files for additional context on the error and troubleshooting steps.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CN01 (Display Network), CN03 (Display Activity), and CJ20N (Project Builder) for managing networks and activities.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Forums: Consider visiting SAP community forums or support channels for additional insights from other users who may have encountered the same issue.
  
  By following these steps, you should be able to identify the cause of the CN801 error and implement a solution to resolve it.