How To Fix WPS01112 - Unidentifiable leaf task list in hierarchy table

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 112

• Message text: Unidentifiable leaf task list in hierarchy table

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WPS01112 - Unidentifiable leaf task list in hierarchy table ?

  Certainly! Here's a detailed explanation regarding the SAP error message:
  
  SAP Error Message:
  WPS01112 - Unidentifiable leaf task list in hierarchy table
  
  Cause:
  This error occurs when the system cannot find or identify a leaf task list in the task list hierarchy table during processing. In SAP Plant Maintenance (PM) or Production Planning (PP), task lists can be structured hierarchically, where a leaf task list is the lowest-level task list without any further sub-tasks.
  The error typically arises due to one or more of the following reasons:
  
  Missing or inconsistent entries in the task list hierarchy table (e.g., table PLIH or PLAS).
  The task list referenced as a leaf node does not exist or has been deleted.
  Data inconsistencies caused by incomplete or incorrect maintenance of task list hierarchies.
  Transport or system copy issues where task list hierarchy data was not properly migrated.
  Custom developments or user exits that manipulate task list data incorrectly.
  
  
  Solution:
  To resolve the error, follow these steps:
  
  
  Check Task List Hierarchy:
  
  Use transaction IA05 (Display Task List Hierarchy) or IA06 (Change Task List Hierarchy) to review the hierarchy.
  Verify that all leaf task lists referenced in the hierarchy exist and are valid.
  
  
  
  Verify Task List Existence:
  
  Check the task lists in transaction IA03 (Display Task List) to ensure the leaf task lists exist.
  If missing, recreate or restore the missing task lists.
  
  
  
  Check Database Tables:
  
  Review entries in tables related to task lists and hierarchies:
  
  PLIH (Task List Header)
  PLAS (Task List Hierarchy)
  PLAF (Task List Operations)
  
  
  Look for inconsistencies or orphaned entries.
  
  
  
  Rebuild or Correct Hierarchy:
  
  If inconsistencies are found, rebuild the hierarchy using standard SAP tools or manually correct the entries.
  Sometimes deleting and recreating the hierarchy can help.
  
  
  
  Transport and System Copy Checks:
  
  If the error appeared after a transport or system copy, verify that all relevant task list data was included.
  Re-import missing objects or perform consistency checks.
  
  
  
  SAP Notes and Support:
  
  Search for SAP Notes related to WPS01112 for any known bugs or patches.
  Example SAP Note: #1234567 (hypothetical) might address hierarchy inconsistencies.
  
  
  
  Custom Code Review:
  
  If custom developments manipulate task lists, review the code for errors or incorrect data handling.
  
  
  
  
  Related Information:
  
  
  Task List Hierarchy:
  
  Task lists can be structured hierarchically to represent complex maintenance or production processes. The leaf task list is the final node without children.
  
  
  Transactions:
  
  IA05 - Display Task List Hierarchy
  IA06 - Change Task List Hierarchy
  IA03 - Display Task List
  IA02 - Change Task List
  
  
  
  Tables:
  
  PLIH - Task List Header
  PLAS - Task List Hierarchy
  PLAF - Task List Operations
  
  
  
  Common Scenarios:
  
  When creating or modifying task list hierarchies, ensure all referenced task lists exist.
  After system migrations, verify data consistency.
  
  
  
  
  If the problem persists after these checks, consider raising a support ticket with SAP, providing detailed logs and system information.
  
  Summary:
  
  The error WPS01112 indicates that the system cannot identify a leaf task list in the hierarchy, usually due to missing or inconsistent data. The solution involves verifying and correcting the task list hierarchy and ensuring all leaf task lists exist and are properly maintained.
  
  If you need help with specific steps or transaction codes, feel free to ask!