How To Fix WPS01003 - Enter a subordinate task list (current task list is hierarchical)

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 003

• Message text: Enter a subordinate task list (current task list is hierarchical)

Self-Explanatory Message

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• What is the cause and solution for SAP error message WPS01003 - Enter a subordinate task list (current task list is hierarchical) ?

  SAP Error Message:
  
  WPS01003 – Enter a subordinate task list (current task list is hierarchical)
  
  Cause:
  This error occurs when you are working with a hierarchical task list in SAP and the system expects you to enter or process a subordinate (child) task list instead of the current (parent) hierarchical task list. Hierarchical task lists consist of a main task list with subordinate task lists linked to it. Certain operations require you to specify or work on the subordinate task list rather than the top-level hierarchical task list.
  
  Explanation:
  
  In SAP Plant Maintenance (PM) or Production Planning (PP), task lists can be single-level or hierarchical.
  A hierarchical task list contains a header task list and one or more subordinate task lists.
  When the system prompts this message, it means the current task list you are trying to process is a hierarchical (header) task list, but the operation requires a subordinate task list.
  For example, when creating or changing operations, confirmations, or scheduling, the system needs the subordinate task list to work on the detailed operations.
  
  
  Solution:
  
  
  Identify the subordinate task list(s):  
  
  Use transaction codes like IA05 (Display task list) or IA06 (Change task list) to view the hierarchical task list and its subordinate task lists.
  Check the structure to find the subordinate task list(s) linked to the hierarchical task list.
  
  
  
  Enter the subordinate task list number:  
  
  Instead of entering the hierarchical (header) task list number, enter the subordinate task list number when prompted.
  This allows the system to process the detailed operations within the subordinate task list.
  
  
  
  If you intended to work on the hierarchical task list:  
  
  Verify if the operation you are performing supports hierarchical task lists.
  Some functions only support single-level or subordinate task lists.
  Adjust your process accordingly.
  
  
  
  Check task list usage and settings:  
  
  Ensure that the task list usage and group are correctly maintained.
  Sometimes, incorrect usage or group settings can cause confusion between hierarchical and subordinate task lists.
  
  
  
  
  Related Information:
  
  
  Task List Types:  
  
  Single-level task list: Contains operations directly.  
  Hierarchical task list: Contains a header and subordinate task lists.
  
  
  
  Transactions to manage task lists:  
  
  IA01: Create task list  
  IA02: Change task list  
  IA03: Display task list  
  IA05: Display hierarchical task list  
  IA06: Change hierarchical task list
  
  
  
  SAP Notes and Documentation:  
  
  Refer to SAP Help Portal for task list management in PM or PP modules.  
  Check SAP Notes if the error persists or occurs unexpectedly.
  
  
  
  
  Summary:
  
  Cause: You entered a hierarchical (header) task list where a subordinate task list is required.  
  Solution: Enter the subordinate task list number instead of the hierarchical task list number.  
  Additional: Use appropriate transactions to view and select subordinate task lists.
  
  
  If you provide the exact transaction or process where this error occurs, I can give more tailored guidance.