How To Fix WPS01006 - &1 &2 &3 references itself as subordinate task list

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 006

• Message text: &1 &2 &3 references itself as subordinate task list

Self-Explanatory Message

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• What is the cause and solution for SAP error message WPS01006 - &1 &2 &3 references itself as subordinate task list ?

  Certainly! Here's detailed information about the SAP error message WPS01006 &1 &2 &3 references itself as subordinate task list:
  
  Error Message
  WPS01006 &1 &2 &3 references itself as subordinate task list
  
  Cause
  This error occurs when a task list (often a maintenance task list or production task list) is assigned as a subordinate task list to itself, either directly or indirectly. In other words, the task list is referencing itself in its hierarchy, which creates a circular reference or loop.
  
  &1 = Task list group
  &2 = Task list group counter
  &3 = Task list type
  
  This self-reference is logically incorrect because a task list cannot be a subordinate of itself.
  
  Explanation
  In SAP Plant Maintenance (PM) or Production Planning (PP), task lists can have hierarchical structures where a main task list can have subordinate task lists. The system prevents circular references to avoid infinite loops during processing.
  If a task list is mistakenly assigned as a subordinate to itself, the system throws this error to alert the user.
  
  Solution
  
  
  Check the Task List Hierarchy:
  
  Go to the task list maintenance transaction (e.g., IA05, IA06 for PM task lists or CA03 for routing).
  Review the subordinate task lists assigned to the main task list.
  Identify if the task list is assigned as a subordinate to itself.
  
  
  
  Remove or Correct the Subordinate Assignment:
  
  Remove the self-reference by deleting the subordinate task list entry that points back to the same task list.
  If the hierarchy is complex, check for indirect loops (e.g., A references B, B references A).
  
  
  
  Save the Corrected Task List:
  
  After removing the self-reference, save the task list.
  The error should no longer appear.
  
  
  
  Check for Custom Code or Interfaces:
  
  If the task lists are created or updated via custom programs or interfaces, ensure that the logic does not create circular references.
  
  
  
  
  Related Information
  
  Transactions:
  
  PM Task Lists: IA05 (Change), IA06 (Display)
  Routing: CA03 (Display), CA02 (Change)
  
  
  Tables:
  
  PLKO - Task list header
  PLPO - Task list operations (subordinate tasks are stored here)
  
  
  Notes and Documentation:
  
  SAP Notes related to task list hierarchy and circular references.
  SAP Help Portal documentation on task lists and their hierarchical structure.
  
  
  
  
  Summary
  
  
  
  Aspect
  Description
  
  
  
  
  Cause
  Task list references itself as subordinate task list (circular reference).
  
  
  Effect
  System throws error WPS01006 to prevent infinite loops.
  
  
  Solution
  Remove the self-reference in the task list hierarchy.
  
  
  Check
  Task list hierarchy in IA05/IA06 or CA02/CA03 transactions.
  
  
  
  
  If you need help with specific steps or transaction codes, feel free to ask!