How To Fix CN852 - Activity loses its internal processing character

CN852 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 852

• Message text: Activity loses its internal processing character

What causes this issue?

You have changed the control key of the activity. The new control key
specifies that the activity is externally processed.

System Response

The activity will be displayed on the overview for externally processed
activities.

Error message extract from SAP system. Copyright SAP SE.

CN852 - Details

• The SAP error message CN852 ("Activity loses its internal processing character") typically occurs in the context of project management and controlling within SAP, particularly when dealing with activities in a project structure. This error indicates that an activity is being changed in a way that affects its internal processing character, which can lead to inconsistencies in project planning and execution.
  
  Cause:
  The error can arise due to several reasons, including:
  
  Change in Activity Type: If an activity is changed from a type that allows certain processing (like a work activity) to a type that does not (like a milestone), it can trigger this error.
  Inconsistent Data: If there are inconsistencies in the data related to the activity, such as incorrect settings or parameters that do not align with the expected processing character.
  Project Structure Changes: Modifications in the project structure that affect the hierarchy or relationships between activities can also lead to this error.
  Status Changes: