How To Fix CN158 - Reference fields of selected activities are not unique

CN158 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 158

• Message text: Reference fields of selected activities are not unique

What causes this issue?

Network activities were determined for the selection criteria you
entered. At least two activities with the same reference field &V1&
exist:
Network/activity &V2&
Network/activity &V3&

System Response

The reference fields in the selected activities must be unique.

How to fix this error?

Check whether the reference fields in the networks are unique.

Error message extract from SAP system. Copyright SAP SE.

CN158 - Details

• The SAP error message CN158 ("Reference fields of selected activities are not unique") typically occurs in the context of project management and controlling, particularly when dealing with network activities in SAP Project System (PS). This error indicates that the system has detected a conflict with the reference fields of the selected activities, meaning that the activities you are trying to process or manipulate are not uniquely identifiable based on the reference fields.
  Causes:
  
  Duplicate Activities: There may be multiple activities with the same reference fields (e.g., same WBS element, same network, etc.) that are being selected for processing.
  Incorrect Selection: The user may have selected multiple activities that are not meant to be processed together due to their non-unique reference fields.
  Data Integrity Issues: There could be underlying data integrity issues in the project structure or network that lead to non-unique references.
  
  Solutions:
  
  Check Activity Selection: Review the activities you have selected for processing. Ensure that