How To Fix UCS0226 - Task &1 must be behind task &2

UCS0226 - Overview

• Message type: E = Error

• Message class: UCS0 - Messages for Status Management

• Message number: 226

• Message text: Task &1 must be behind task &2

What causes this issue?

Task &V2& is executed by consolidation unit; copy task &V1& is executed
by consolidation group. A copy task that is run per consolidation group
needs to be assorted after the last task that is run per consolidation
unit. However, task &V1& is located prior to task &V2&.

System Response

The task sequence cannot be saved.

How to fix this error?

Correct the task sequence.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

UCS0226 - Details

• The SAP error message UCS0226, which states "Task &1 must be behind task &2," typically occurs in the context of task sequencing in a project or workflow. This error indicates that there is a dependency between two tasks, where task &1 is incorrectly scheduled to occur before task &2, which is not allowed based on the defined dependencies.
  
  Cause:
  The error is caused by a violation of the task dependency rules in the project or workflow. Specifically, it means that the system has detected that task &1 is set to start or finish before task &2, even though task &2 is a prerequisite for task &1. This can happen due to:
  
  Incorrect task scheduling.
  Manual changes to task dates that do not respect the defined dependencies.
  Changes in the project structure that were not properly updated in the task dependencies.
  
  
  Solution:
  To resolve the UCS0226 error, you can take the following steps:
  
  
  Check Task Dependencies: Review the dependencies