How To Fix CN828 - Start of time interval must not be negative

CN828 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 828

• Message text: Start of time interval must not be negative

What causes this issue?

You have entered a value for the time interval that is <ZH>before</>
the start date of the activity. This is not allowed.

System Response

INCLUDE 'NA_ALLG_NOVERARBEITUNG' OBJECT DOKU ID TX

How to fix this error?

Enter a different time interval for the start of the activity element.

Error message extract from SAP system. Copyright SAP SE.

CN828 - Details

• The SAP error message CN828 "Start of time interval must not be negative" typically occurs in the context of project management or controlling modules, particularly when dealing with time intervals for activities, costs, or scheduling. This error indicates that a time interval has been defined incorrectly, where the start time is set to a negative value, which is not permissible.
  
  Cause:
  
  Incorrect Data Entry: The most common cause is that a user has entered a negative value for the start time of a project activity or cost element.
  Date Calculation Errors: If there are calculations or formulas that derive the start time from other values, an error in those calculations could lead to a negative start time.
  
  Configuration Issues: There may be issues in the configuration of the project or controlling settings that lead to incorrect time interval definitions.
  
  
  Solution:
  
  Check Input Values: Review the input values for the time intervals in the relevant transaction or