How To Fix CJ171 - Your relationship's predecessor or successor is not an activity

SAP Error Message - Details

• Message type: E = Error

• Message class: CJ - Project master data and structure

• Message number: 171

• Message text: Your relationship's predecessor or successor is not an activity

What causes this issue?

You want to create a relationship between two project objects.
However, at least one of these objects is not an activity.

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?

Create relationships between activities only.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CJ171 - Your relationship's predecessor or successor is not an activity ?

  The SAP error message CJ171 indicates that there is an issue with the relationship defined in a project structure, specifically that either the predecessor or successor in a relationship is not recognized as an activity. This error typically occurs in the Project System (PS) module when you are trying to create or modify relationships between activities in a project.
  Cause:
  
  Incorrect Object Type: The predecessor or successor you are trying to link is not an activity. It could be a milestone, a WBS element, or another type of object that does not support relationships in the same way that activities do.
  Inactive or Deleted Activities: The activity you are trying to reference may have been deleted or is currently inactive.
  Incorrect Configuration: There may be configuration issues in the project structure that prevent the system from recognizing the relationship correctly.
  
  Solution:
  
  Verify Object Types: Check the objects you are trying to link. Ensure that both the predecessor and successor are valid activities. You can do this by navigating to the project structure and confirming the types of the objects.
  Check Activity Status: Ensure that the activities involved in the relationship are active and have not been deleted. You can check the status of the activities in the project management transaction (e.g., CJ20N).
  Correct the Relationship: If you find that one of the objects is not an activity, you will need to either change the relationship to link valid activities or create the necessary activities if they do not exist.
  Review Project Structure: Ensure that the project structure is correctly set up and that all necessary activities are defined properly.
  Use Transaction Codes: Use transaction codes like CJ20N (Project Builder) to review and modify the project structure and relationships.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CJ20N (Project Builder), CJ02 (Change Work Breakdown Structure), and CJ03 (Display Work Breakdown Structure).
  Documentation: Refer to SAP documentation or help files for detailed information on project structures and relationships.
  SAP Notes: Check for any relevant SAP Notes that might address specific issues related to this error message.
  User Permissions: Ensure that you have the necessary permissions to modify project structures and relationships.
  
  By following these steps, you should be able to resolve the CJ171 error and successfully manage the relationships within your project.