How To Fix CN480 - Work data changed, calculation key set to manual

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 480

• Message text: Work data changed, calculation key set to manual

What causes this issue?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN480 - Work data changed, calculation key set to manual ?

  The SAP error message CN480 ("Work data changed, calculation key set to manual") typically occurs in the context of project management and cost planning within the SAP system, particularly when dealing with network activities or project structures. This message indicates that the system has detected changes in the work data (such as planned costs, work hours, or other relevant parameters) that affect the calculation of costs or other metrics.
  Cause:
  
  Data Changes: The most common cause of this error is that the work data for a project or network activity has been modified after the initial calculations were performed. This could be due to manual updates, changes in resource assignments, or adjustments in planned costs.
  Automatic Calculation Disabled: When the system detects changes, it may switch the calculation method to manual to prevent automatic recalculations that could lead to inconsistencies or errors in the data.
  User Actions: Users may have manually changed certain fields or parameters that trigger this message.
  
  Solution:
  
  Review Changes: Check the changes made to the work data. Identify what specific data was altered and whether those changes were intended.
  Recalculate: If the changes are valid and you want the system to recalculate the costs or other metrics, you can manually trigger a recalculation. This can often be done through the transaction codes related to project management (e.g., CJ20N for project structures).
  Set Calculation Key: If you want to revert to automatic calculations, you may need to reset the calculation key back to automatic. This can usually be done in the project or network activity settings.
  Consult Documentation: Refer to SAP documentation or help resources for specific steps related to your version of SAP, as the exact navigation may vary.
  User Training: Ensure that users are trained on how to properly manage work data and understand the implications of changing certain fields.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CJ20N (Project Builder), CN41 (Overview of Network Activities), and others that pertain to project management.
  SAP Notes: Check for any SAP Notes or updates that may address this specific error or provide additional guidance.
  System Configuration: Sometimes, system configuration settings can affect how calculations are handled. Consult with your SAP Basis or configuration team if you suspect this might be the case.
  Testing: If you are in a development or testing environment, try replicating the issue to better understand the conditions that lead to the CN480 message.
  
  By following these steps, you should be able to address the CN480 error and ensure that your project data is accurately calculated and managed within SAP.