How To Fix CN634 - Not possible to change the project definition -> see long text

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 634

• Message text: Not possible to change the project definition -> see long text

What causes this issue?

The delivery information is still assigned to WBS elements in the
current project.

System Response

The project definition could not be changed, since delivery information
can only by assigned to one project.

How to fix this error?

To change the project definition, you must first delete the existing
assignments to the WBS elements.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN634 - Not possible to change the project definition -> see long text ?

  The SAP error message CN634, which states "Not possible to change the project definition -> see long text," typically occurs when there are restrictions on modifying a project definition in the Project System (PS) module. This error can arise due to various reasons, including:
  Causes:
  
  Project Status: The project may be in a status that does not allow changes. For example, if the project is completed or closed, modifications may be restricted.
  Authorization Issues: The user may not have the necessary authorizations to make changes to the project definition.
  Locked Project: The project might be locked for changes due to ongoing processes or workflows.
  Project Type Restrictions: Certain project types may have specific restrictions on modifications.
  Dependencies: There may be dependencies or relationships with other projects or objects that prevent changes.
  
  Solutions:
  
  Check Project Status: Review the status of the project. If it is completed or closed, you may need to reopen it or change its status to allow modifications.
  Review Authorizations: Ensure that the user has the appropriate authorizations to modify the project definition. This can be checked with the security team or by reviewing the user's roles and permissions.
  Unlock the Project: If the project is locked, determine the reason for the lock and resolve it. This may involve coordinating with other users or processes that are currently using the project.
  Consult Long Text: The long text associated with the error message may provide specific details about why the change is not possible. You can access this by clicking on the error message or using transaction codes like SE91 to view the message class and long text.
  Check Project Type: If the project type has restrictions, consult the project management guidelines or documentation to understand what changes are permissible.
  Review Dependencies: Investigate any dependencies or relationships with other projects or objects that may be causing the restriction.
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like CJ20N (Project Builder) or CJ02 (Change Project) to access and review project details.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance.
  Documentation: Refer to SAP documentation or user manuals for the Project System module for more detailed information on project management and error handling.
  
  If the issue persists after checking these aspects, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in the Project System module.