How To Fix C5451 - You can only maintain relationships between phases

C5451 - Overview

• Message type: E = Error

• Message class: C5 - Master Recipe

• Message number: 451

• Message text: You can only maintain relationships between phases

What causes this issue?

You want to maintain operations with relationships. This is not
necessary in the master recipe and is prevented by the system.
Relationships are only maintained so that start and finish dates can be
determined by the scheduling function. The results are used by
capacity scheduling.

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?

Please maintain the relationships between phases.

Error message extract from SAP system. Copyright SAP SE.

C5451 - Details

• The SAP error message C5451, "You can only maintain relationships between phases," typically occurs in the context of project management or process management within SAP, particularly when dealing with the Project System (PS) or similar modules where phases and relationships are defined.
  
  Cause:
  This error arises when a user attempts to create or modify a relationship between objects that are not phases. In SAP, relationships are typically defined between phases of a project or process, and if the objects involved in the relationship are not recognized as phases, the system will throw this error.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Object Types: Ensure that the objects you are trying to relate are indeed phases. You can do this by reviewing the definitions of the objects in the project or process structure.
  
  
  Review Project Structure: Navigate to the project structure and confirm that the phases are correctly defined. You may need