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

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• 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 list in a way that is not allowed while it is still referenced in hierarchies.
  
  
  Solution / How to resolve:
  
  
  Check Task List Hierarchies:
  
  Use transaction IAHL (Display Task List Hierarchies) or IA05 (Change Task List Hierarchy) to find the hierarchies where the task list is used.
  Enter the task list number and type to see all hierarchies referencing it.
  
  
  
  Remove the Task List from Hierarchies:
  
  In the hierarchy maintenance screen, remove the task list from all hierarchies where it is assigned.
  Save the changes.
  
  
  
  Delete or Change the Task List:
  
  After removing the task list from all hierarchies, you can proceed to delete or modify the task list as needed.
  
  
  
  Check Authorizations:
  
  Ensure you have the necessary authorizations to change hierarchies and task lists.
  
  
  
  
  Additional Information:
  
  Task List Hierarchies are used to group multiple task lists into a structured format, often to represent complex maintenance or production processes.
  Deleting or modifying task lists without removing them from hierarchies can cause inconsistencies in maintenance plans or production orders.
  Always perform such changes carefully and preferably in a test environment before applying in production.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error Message
  WPS01051: Task list &2 (type &1) is still used in hierarchies
  
  
  Cause
  Task list is assigned to one or more hierarchies and cannot be deleted or changed.
  
  
  Solution
  Remove the task list from all hierarchies using IAHL or IA05, then proceed with deletion or modification.
  
  
  Transaction Codes
  IAHL (Display Hierarchies), IA05 (Change Hierarchies)
  
  
  
  
  If you need further assistance or specific steps for your SAP system version, feel free to ask!