How To Fix WPS01051 - Task list &2 (type &1) is still used in hierarchies

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 051

• Message text: Task list &2 (type &1) is still used in hierarchies

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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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Smart SAP Assistant

• What is the cause and solution for SAP error message WPS01051 - Task list &2 (type &1) is still used in hierarchies ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WPS01051: Task list &2 (type &1) is still used in hierarchies
  
  Meaning / 
  Cause:
  This error occurs when you try to delete or change a task list (maintenance task list, production task list, or other types) that is currently assigned or referenced in one or more task list hierarchies. SAP prevents deletion or certain changes to task lists that are still linked in hierarchies to maintain data consistency and avoid orphaned references.
  
  &1 = Task list type (e.g., PM task list, production task list, etc.)
  &2 = Task list number
  
  The system checks if the task list is part of any hierarchy (a structured grouping of task lists) and blocks the operation if it is still in use.
  
  When does it occur?
  
  When attempting to delete a task list that is assigned to one or more task list hierarchies.
  When trying to change or modify a task