How To Fix TN120 - Predecessor &1 of &2 does not exist

TN120 - Overview

• Message type: E = Error

• Message class: TN - Support Package Manager (SPAM) Messages

• Message number: 120

• Message text: Predecessor &1 of &2 does not exist

What causes this issue?

The queue is not consistent because the predecessor &V1& of &V2& is
missing.

System Response

The queue cannot be confirmed.

How to fix this error?

&V1& has probably not yet been downloaded to your system.
Request the Support Package in SAPNet - R/3 Frontend and load it into
your system.
Then confirm the queue.

Error message extract from SAP system. Copyright SAP SE.

TN120 - Details

• The SAP error message TN120, which states "Predecessor &1 of &2 does not exist," typically occurs in the context of project management or production planning when there is an issue with task dependencies or relationships between different elements (like activities, tasks, or orders) in a project or production order.
  
  Cause:
  
  
  Missing Predecessor: The predecessor task or activity (denoted as &1) that is supposed to be linked to the current task or activity (denoted as &2) does not exist in the system. This could be due to:
  
  The predecessor was deleted or not created.
  There is a typo or incorrect entry in the predecessor field.
  The predecessor is in a different project or order that is not accessible.
  
  
  
  Data Inconsistency: There may be inconsistencies in the data, such as incorrect configuration or missing entries in the relevant tables.
  
  
  Authorization Issues: Sometimes, the user may not have the necessary authorizations to view or access the predecessor task.
  
  
  
  Solution:
  
  
  Check Predecessor Entry: