How To Fix WPS01004 - Input of a subordinate task list is not allowed (-> F1)

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 004

• Message text: Input of a subordinate task list is not allowed (-> F1)

Self-Explanatory Message

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• What is the cause and solution for SAP error message WPS01004 - Input of a subordinate task list is not allowed (-> F1) ?

  Certainly! Here's a detailed explanation for the SAP error message WPS01004:
  
  SAP Error Message:
  WPS01004 - Input of a subordinate task list is not allowed (-> F1)
  
  Cause:
  This error occurs when you try to enter or assign a subordinate task list directly in a context where only a main (superordinate) task list is allowed. In SAP Plant Maintenance (PM) or Production Planning (PP), task lists can be structured hierarchically:
  
  Main (superordinate) task list: The primary task list that can have subordinate task lists assigned to it.
  Subordinate task list: A task list that is linked to a main task list and cannot be used independently in certain transactions.
  
  The system restricts the direct input or assignment of subordinate task lists in places where only main task lists are valid, to maintain the integrity of the task list hierarchy.
  
  When does this happen?
  
  When creating or changing maintenance plans, maintenance orders, or production orders.
  When assigning task lists in operations or maintenance plans.
  When trying to input a subordinate task list number directly instead of the main task list.
  
  
  Solution:
  
  
  Use the main (superordinate) task list number instead of the subordinate task list number in the input field.
  
  
  Check the task list hierarchy:
  
  Go to the task list display transaction (e.g., IA05 for equipment task lists, IA06 for functional location task lists, or CA03 for routing/task lists in PP).
  Verify which task list is the main task list and which are subordinate.
  
  
  
  Assign the main task list in the relevant transaction (e.g., maintenance plan, order).
  
  
  If you need to work with subordinate task lists, do so only in the context of the main task list, not as standalone entries.
  
  
  
  Additional Information:
  
  Task list hierarchy is used to break down complex maintenance or production processes into manageable parts.
  Subordinate task lists are linked to main task lists via the "Subordinate task list" assignment in the task list header or operations.
  This error helps prevent inconsistent or incomplete task list assignments that could cause issues in order processing or maintenance execution.
  For more details, you can press F1 on the error message in SAP to get context-sensitive help.
  SAP Notes or documentation related to task list management and maintenance planning may provide further guidance.
  
  
  Summary:
  
  
  
  Aspect
  Description
  
  
  
  
  Cause
  Attempt to input a subordinate task list where only a main task list is allowed.
  
  
  Solution
  Use the main (superordinate) task list number instead. Verify task list hierarchy.
  
  
  Related Transactions
  IA05, IA06, CA03, IP42, IW31, IW32 (maintenance and production order/task list transactions)
  
  
  Additional Info
  Subordinate task lists cannot be used independently; they must be linked to a main task list.
  
  
  
  
  If you need help identifying the main task list or adjusting your process, please provide the transaction or scenario where the error occurs, and I can assist further!