How To Fix CN891 - Due to existing assignments milestone & & cannot be deleted

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 891

• Message text: Due to existing assignments milestone & & cannot be deleted

What causes this issue?

The milestone cannot be deleted because it is linked with a billing
plan.

System Response

INCLUDE NA_ALLG_NOVERARBEITUNG OBJECT DOKU ID TX

How to fix this error?

Delete the link between the milestone and the billing plan. To do so,
delete the milestone dates.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN891 - Due to existing assignments milestone & & cannot be deleted ?

  The SAP error message CN891 indicates that there are existing assignments related to a milestone in a project, which prevents the deletion of that milestone. This typically occurs in the context of project management within SAP, particularly when dealing with project structures and milestones in the Project System (PS) module.
  Cause:
  The error occurs because:
  
  Existing Dependencies: The milestone you are trying to delete has dependencies or assignments that are still active. This could include tasks, activities, or other project elements that are linked to the milestone.
  Status of the Milestone: The milestone may be in a status that does not allow for deletion, such as being part of a closed project or having been used in reporting.
  Data Integrity: SAP enforces data integrity rules to ensure that deleting a milestone does not lead to inconsistencies in project data.
  
  Solution:
  To resolve the CN891 error, you can take the following steps:
  
  
  Check Assignments: 
  
  Review the assignments related to the milestone. You can do this by navigating to the project structure and checking which activities or elements are linked to the milestone.
  Use transaction codes like CJ20N (Project Builder) to view the project structure and identify dependencies.
  
  
  
  Remove Dependencies:
  
  If there are activities or tasks assigned to the milestone, you will need to remove those assignments first. This may involve changing the project plan or reassigning tasks to different milestones.
  
  
  
  Change Milestone Status:
  
  Ensure that the milestone is not in a status that prevents deletion. If necessary, change the status of the milestone to allow for deletion.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for specific instructions on handling milestones and their dependencies.
  
  
  
  Use Transaction Codes:
  
  You can use transaction codes like CJ02 (Change Work Breakdown Structure) to modify the milestone or CJ03 (Display Work Breakdown Structure) to view its details.
  
  
  
  Seek Help from SAP Support:
  
  If you are unable to resolve the issue, consider reaching out to your SAP support team or consulting SAP Notes for any known issues related to this error.
  
  
  
  Related Information:
  
  SAP Project System (PS): Understanding the structure of projects in SAP PS is crucial for managing milestones and their dependencies.
  Data Integrity: SAP maintains strict data integrity rules, and understanding these can help in troubleshooting similar issues.
  Transaction Codes: Familiarity with relevant transaction codes can expedite the process of identifying and resolving issues related to project management in SAP.
  
  By following these steps, you should be able to identify the cause of the CN891 error and take appropriate action to resolve it.