How To Fix UCUM026 - Task hierarchy contains ambiguous task or task group IDs

SAP Error Message - Details

• Message type: E = Error

• Message class: UCUM - Messages for Monitor

• Message number: 026

• Message text: Task hierarchy contains ambiguous task or task group IDs

What causes this issue?

The name of a task or task group occurs more than once in the task
hierarchy of your system. This inconsistency must be remedied.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Change the definition of the task hierarchy in the consolidation
workbench. When doing so, delete any duplicate occurrences of the names
of tasks and task groups from the hierarchy. Each name can occur once
only.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message UCUM026 - Task hierarchy contains ambiguous task or task group IDs ?

  The SAP error message UCUM026, which states "Task hierarchy contains ambiguous task or task group IDs," typically occurs in the context of SAP's Unified Change Management (UCM) or similar project management functionalities. This error indicates that there are duplicate or conflicting task or task group IDs within the task hierarchy, which can lead to confusion in task assignment and tracking.
  Cause:
  
  Duplicate IDs: The most common cause is that there are two or more tasks or task groups with the same ID in the hierarchy.
  Incorrect Hierarchy Structure: The structure of the task hierarchy may not be properly defined, leading to ambiguity in task identification.
  Data Migration Issues: If data has been migrated from another system or if there have been recent changes to the task structure, it may have introduced duplicates or conflicts.
  Manual Entry Errors: Users may have manually created tasks or groups with the same identifiers without realizing it.
  
  Solution:
  
  
  Identify Duplicates: 
  
  Use transaction codes like SE16 or SE11 to access the relevant database tables (e.g., TCU_TASKS, TCU_TASK_GROUPS) and check for duplicate entries.
  You can also use reports or queries to list all task IDs and identify duplicates.
  
  
  
  Correct the Hierarchy:
  
  Once duplicates are identified, you can either rename or delete the conflicting tasks or task groups to ensure that each ID is unique.
  Ensure that the hierarchy is structured correctly, with clear parent-child relationships.
  
  
  
  Review Data Migration:
  
  If the issue arose after a data migration, review the migration process to ensure that it correctly handled task IDs and did not introduce duplicates.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or support notes related to task management and hierarchy structures for additional guidance.
  
  
  
  Testing:
  
  After making changes, test the task hierarchy to ensure that the error is resolved and that tasks can be assigned and tracked correctly.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Transaction Codes: Familiarize yourself with relevant transaction codes for task management, such as UCM for Unified Change Management.
  User Roles: Ensure that users have the appropriate roles and permissions to create and manage tasks within the system.
  Training: Consider providing training for users on how to properly create and manage tasks to avoid future issues.
  
  If the problem persists after following these steps, it may be beneficial to reach out to SAP support for further assistance.