How To Fix C5456 - Relationships already exist between the phases you have selected

C5456 - Overview

• Message type: E = Error

• Message class: C5 - Master Recipe

• Message number: 456

• Message text: Relationships already exist between the phases you have selected

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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C5456 - Details

• The SAP error message C5456, which states "Relationships already exist between the phases you have selected," typically occurs in the context of project management or process management within SAP, particularly when dealing with the Project System (PS) module or similar functionalities.
  
  Cause:
  This error arises when you attempt to create a relationship (dependency) between two phases (or activities) in a project that already have an existing relationship. The system prevents the creation of duplicate relationships to maintain data integrity and avoid confusion in project scheduling.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Existing Relationships:
  
  Navigate to the project or activity in question and review the existing relationships. You can do this by using transaction codes like CJ20N (Project Builder) or CJ02 (Change Project).
  Look for the phases you are trying to link and see if there is already a relationship defined.
  
  
  
  Modify Existing Relationships:
  
  If you find that a relationship already exists, you may