How To Fix CN336 - Event is referenced completely. Manual maintenance not possible

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 336

• Message text: Event is referenced completely. Manual maintenance not possible

What causes this issue?

You want to maintain dates for an event to which existing system fields
have been assigned for all date types.

System Response

Consequently you cannot maintain the dates manually.

How to fix this error?

In Customizing check the <DS:SIMG.SIMG_OLPR_TCNTM01F>Assignment of
Events to Reference Dates</>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN336 - Event is referenced completely. Manual maintenance not possible ?

  The SAP error message CN336: Event is referenced completely. Manual maintenance not possible typically occurs in the context of project management and network planning within SAP, particularly in the Project System (PS) module. This error indicates that the event you are trying to modify or maintain is already fully referenced by other objects, such as activities or milestones, and therefore cannot be changed manually.
  Cause:
  
  Complete Referencing: The event is fully referenced by other elements in the project, meaning that it is linked to activities or other events that have already been scheduled or completed.
  Status of the Project: The project or network might be in a status that does not allow for manual changes, such as being released or completed.
  Dependencies: There may be dependencies or constraints that prevent changes to the event.
  
  Solution:
  
  Check References: Review the project structure to identify which activities or elements are referencing the event. You can do this by navigating to the project or network and checking the relationships.
  Adjust Dependencies: If possible, adjust or remove the dependencies that are causing the event to be locked for manual maintenance.
  Change Project Status: If the project is in a status that restricts changes (like "Released"), consider changing the status to allow for modifications. This may require appropriate authorizations.
  Use Transaction Codes: Utilize transaction codes like CJ20N (Project Builder) or CN22 (Change Network) to navigate and manage the project elements effectively.
  Consult Documentation: Refer to SAP documentation or help files for specific instructions related to your version of SAP, as there may be version-specific nuances.
  Contact Support: If you are unable to resolve the issue, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes in SAP Project System, such as CJ01 (Create Work Breakdown Structure), CJ02 (Change Work Breakdown Structure), and CJ20N (Project Builder).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Authorizations: Ensure that you have the necessary authorizations to make changes to the project or network elements.
  Training and Documentation: Consider training sessions or documentation on SAP Project System to better understand how events and activities are managed.
  
  By following these steps, you should be able to address the CN336 error and proceed with your project management tasks in SAP.