How To Fix WPS01120 - Parent task list key &1 / ext. ID &2: Invalid change number

WPS01120 - Overview

• Message type: E = Error

• Message class: WPS01 - Revision Planning - Task List Hierarchy

• Message number: 120

• Message text: Parent task list key &1 / ext. ID &2: Invalid change number

Self-Explanatory Message

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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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• What is the cause and solution for SAP error message WPS01120 - Parent task list key &1 / ext. ID &2: Invalid change number ?

  SAP Error Message:
  WPS01120 Parent task list key &1 / ext. ID &2: Invalid change number
  
  Meaning / 
  Cause:
  This error occurs when you try to assign or reference a change number (change request) that is not valid or does not exist in the system for the specified parent task list. In SAP Plant Maintenance (PM) or Production Planning (PP), task lists can be managed under change management to control modifications. The system checks the validity of the change number when you attempt to link or use it.
  Common causes include:
  
  The change number does not exist in the system.
  The change number is not released or is invalid for the object type.
  The change number is not assigned to the task list or the relevant object.
  Typographical error or incorrect input of the change number.
  The change number is from a different object or task list.
  
  
  Where it occurs:
  
  When creating or changing task lists (e.g., routing, maintenance task lists)