How To Fix UCS0162 - Recursive linking of source tasks (&3)

UCS0162 - Overview

• Message type: E = Error

• Message class: UCS0 - Messages for Status Management

• Message number: 162

• Message text: Recursive linking of source tasks (&3)

What causes this issue?

Source task &V2& is assigned to copy task &V1&. But that source task
also, directly or indirectly, points to source task &V3& - according to
the following sequence: &V4&.
The system cannot unambiguously interpret these kinds of recursive
source task assignments and, therefore, considers them invalid.

System Response

The definition of task &V1& is inconsistent and cannot be saved in its
current state.

How to fix this error?

Drop the assignment of task &V2& as the source task for copy task &V1&
for now.
Check the source tasks of all tasks affected in the recursion and if
necessary, adjust your settings.

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.

UCS0162 - Details

• The SAP error message UCS0162, which states "Recursive linking of source tasks (&3)," typically occurs in the context of SAP's Project System (PS) or when dealing with task dependencies in a project. This error indicates that there is a circular dependency among tasks, meaning that a task is indirectly linked to itself through other tasks, which creates a recursive loop.
  
  Cause:
  The primary cause of this error is the configuration of task dependencies where:
  
  A task is set to depend on another task that, in turn, depends on the first task, creating a circular reference.
  This can happen due to incorrect settings in the task relationships or when tasks are linked inappropriately during project planning.
  
  
  Solution:
  To resolve the UCS0162 error, you can follow these steps:
  
  
  Review Task Dependencies:
  
  Go through the task relationships in your project. Check the predecessor and successor relationships to identify any circular dependencies.
  Use transaction codes like CJ20N (Project Builder) or CJ02 (Change Project)