How To Fix CN638 - Assignments to invalid objects are deleted when you save

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 638

• Message text: Assignments to invalid objects are deleted when you save

What causes this issue?

Assignemnts to objects that no longer exist were found.

System Response

The assignments to invalid objects are deleted, when you save.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN638 - Assignments to invalid objects are deleted when you save ?

  The SAP error message CN638 ("Assignments to invalid objects are deleted when you save") typically occurs in the context of project management or controlling modules, particularly when dealing with network activities, work breakdown structures (WBS), or cost centers. This error indicates that there are assignments in your project or network that reference objects that are no longer valid or do not exist in the system.
  Causes:
  
  Deleted Objects: The error often arises when you have assignments to objects (like WBS elements, networks, or cost centers) that have been deleted or are inactive.
  Incorrect Object References: The project or network may reference objects that were never created or have been changed in a way that makes them invalid.
  Transport Issues: If you are working in a development environment and have