How To Fix CN189 - A reference object cannot be entered for the method 'Update'

CN189 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 189

• Message text: A reference object cannot be entered for the method 'Update'

What causes this issue?

A reference object has been entered for the object type 'Hierarchy' in
the "Update" command. A reference number and/or an object key has been
entered in the command table.

System Response

INCLUDE NA_ALLG_NOVERARBEITUNG OBJECT DOKU ID TX
&NOTE&
Always enter the complete hierarchy in the hierarchy table.

Error message extract from SAP system. Copyright SAP SE.

CN189 - Details

• The SAP error message CN189, which states "A reference object cannot be entered for the method 'Update'," typically occurs in the context of SAP Project System (PS) or related modules when there is an attempt to update a project or network activity with an invalid reference object.
  
  Cause:
  
  Invalid Reference Object: The error usually arises when the system expects a specific type of object (like a WBS element or network activity) but receives a reference object that is not valid for the operation being performed.
  Incorrect Method Usage: The method 'Update' may not be applicable for the type of object you are trying to reference. For example, if you are trying to update a project with a network activity reference that is not properly defined or does not exist.
  
  Configuration Issues: There may be configuration settings in the system that restrict the use of certain reference objects for updates.
  Authorization Issues: Sometimes, the user may