How To Fix CN852 - Activity loses its internal processing character

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN852 - Activity loses its internal processing character ?

  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: Changing the status of an activity in a way that conflicts with its defined processing character.
  
  Solution:
  To resolve the CN852 error, consider the following steps:
  
  
  Review Activity Type: Check the type of the activity that is causing the error. Ensure that the type is appropriate for the intended processing. If necessary, revert any changes that may have altered the activity type incorrectly.
  
  
  Check Data Consistency: Verify that all related data for the activity is consistent. This includes checking for any missing or incorrect entries in the activity's parameters, such as dates, resources, and dependencies.
  
  
  Examine Project Structure: Look at the overall project structure to ensure that any changes made do not conflict with the processing character of the activity. If changes were made, consider reverting them or adjusting the activity accordingly.
  
  
  Status Review: If the activity's status was changed, ensure that the new status is compatible with the activity's processing character. If necessary, change the status back to a compatible one.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines related to the activity types and their processing characters.
  
  
  SAP Notes and Support: Check for any relevant SAP Notes that may address this specific error. If the issue persists, consider reaching out to SAP support for further assistance.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CJ20N (Project Builder) or CJ02 (Change Project) to manage project activities effectively.
  SAP Community: Engage with the SAP Community forums for insights and solutions shared by other users who may have encountered similar issues.
  Training and Documentation: Consider training sessions or documentation on project management in SAP to better understand the implications of activity types and processing characters.
  
  By following these steps, you should be able to identify the root cause of the CN852 error and implement a suitable solution.