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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message C5451 - You can only maintain relationships between phases ?

  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 to create or adjust the phases to ensure they are set up properly.
  
  
  Use Correct Transaction Codes: Make sure you are using the appropriate transaction codes for maintaining relationships. For example, use transaction codes like CJ20N for project management.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for guidance on how to properly maintain relationships between phases.
  
  
  Check Authorizations: Ensure that you have the necessary authorizations to maintain relationships in the project or process. Lack of proper permissions can sometimes lead to unexpected errors.
  
  
  Contact Support: If the issue persists after checking the above points, consider reaching out to your SAP support team or consulting SAP Notes for any known issues related to this error.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific patches or updates related to this error message.
  Project Management Best Practices: Familiarize yourself with best practices in project management within SAP to avoid similar issues in the future.
  Training and Documentation: Consider training sessions or documentation on SAP Project System to better understand how to manage phases and relationships effectively.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.