How To Fix CN188 - A reference object cannot be entered for the method 'Save'

CN188 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 188

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

What causes this issue?

A reference number for an object or an object key has been entered in
the command table for the "Save" command.

System Response

INCLUDE NA_ALLG_NOVERARBEITUNG OBJECT DOKU ID TX
&NOTE&
The "Save" command always refers to all the objects and methods that
were transferred.

Error message extract from SAP system. Copyright SAP SE.

CN188 - Details

• The SAP error message CN188, which states "A reference object cannot be entered for the method 'Save'," typically occurs in the context of SAP Project System (PS) or related modules when there is an issue with the data being processed in a transaction or function module.
  
  Cause:
  
  Incorrect Object Type: The error often arises when the system expects a specific type of object (like a network, activity, or project) but receives a reference object that is not valid for the operation being performed.
  Missing or Incomplete Data: If the required fields or data for the object are not filled out correctly, the system may not be able to process the save operation.
  
  Configuration Issues: There may be configuration settings in the project system that are not aligned with the data being processed.
  Authorization Issues: Sometimes, the user may not have the necessary authorizations to perform the save operation on the specified object.
  
  
  Solution:
  
  Check Object Type: Ensure