How To Fix WPS01212 - Task list & & & is not hierarchical

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 212

• Message text: Task list & & & is not hierarchical

Self-Explanatory Message

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• What is the cause and solution for SAP error message WPS01212 - Task list & & & is not hierarchical ?

  SAP Error Message:
  
  WPS01212 Task list & & & is not hierarchical
  
  Cause
  This error occurs when you try to perform an operation that requires a hierarchical task list, but the task list you are using is not defined as hierarchical. In SAP Plant Maintenance (PM) or Production Planning (PP), task lists can be either:
  
  Single-level (non-hierarchical): Tasks are listed without any parent-child relationships.
  Hierarchical: Tasks are structured with main tasks and sub-tasks, showing a clear hierarchy.
  
  If the system expects a hierarchical task list (for example, when creating a maintenance order or when using certain functions that require task breakdowns), but the task list is flat (non-hierarchical), this error is triggered.
  
  When does it typically occur?
  
  When you try to use a single-level task list in a process or transaction that requires a multi-level (hierarchical) task list.
  When you try to assign or copy a task list that is not hierarchical into a context that demands hierarchy.
  During order creation or maintenance planning where hierarchical task lists are mandatory.
  
  
  Solution
  
  
  Check the Task List Type:
  
  Go to the task list in transaction IA05 (Display Task List) or IA06 (Change Task List).
  Verify if the task list is hierarchical or single-level.
  
  
  
  Use a Hierarchical Task List:
  
  If your process requires a hierarchical task list, create or use an existing hierarchical task list.
  You can create a hierarchical task list in transaction IA05 or IA06 by defining main tasks and sub-tasks properly.
  
  
  
  Modify the Process or Transaction:
  
  If possible, adjust the process or transaction to accept single-level task lists if hierarchy is not essential.
  Check customizing or configuration if the system is set to require hierarchical task lists unnecessarily.
  
  
  
  Consult Documentation or SAP Notes:
  
  Sometimes, specific SAP Notes address this error in the context of your SAP version or module.
  Search SAP Support Portal with the error message code WPS01212 for any relevant notes.
  
  
  
  
  Related Information
  
  
  Task List Types in SAP:
  
  Single-level task list: Tasks are independent, no parent-child relationship.
  Hierarchical task list: Tasks are structured in a tree-like hierarchy.
  
  
  
  Transactions:
  
  IA05 - Display Task List
  IA06 - Change Task List
  IA01 - Create Task List
  
  
  
  SAP Modules:
  
  Plant Maintenance (PM)
  Production Planning (PP)
  
  
  
  SAP Help:
  
  Refer to SAP Help Portal for task list management and hierarchy concepts.
  Check configuration under Plant Maintenance ? Maintenance Planning ? Task Lists.
  
  
  
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Cause
  Task list used is not hierarchical but the process requires a hierarchical task list.
  
  
  Solution
  Use or create a hierarchical task list; verify task list type; adjust process if needed.
  
  
  Related
  Transactions IA05, IA06; SAP Notes; PM and PP modules; task list configuration.
  
  
  
  
  If you provide the exact transaction or process where this error occurs, I can help with more specific guidance.