How To Fix CN829 - Finish of time interval must not be positive

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 829

• Message text: Finish of time interval must not be positive

What causes this issue?

You have entered a value for the time interval that is <ZH>after</>
the finish 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 finish of the activity element.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN829 - Finish of time interval must not be positive ?

  The SAP error message CN829 ("Finish of time interval must not be positive") typically occurs in the context of project management or network planning within SAP, particularly when dealing with scheduling and time intervals for activities or tasks.
  Cause:
  This error usually arises when there is an inconsistency in the scheduling of activities. Specifically, it indicates that the finish date or time of a time interval (such as a work package or task) is set to a positive value (i.e., a future date) when it should not be. This can happen due to:
  
  Incorrect Date Entries: The finish date of a task is set incorrectly, possibly due to manual entry errors.
  Dependencies and Constraints: There may be conflicting dependencies or constraints that lead to an invalid scheduling scenario.
  Project Structure Issues: Problems in the project structure, such as overlapping tasks or incorrect relationships between tasks, can also trigger this error.
  
  Solution:
  To resolve the CN829 error, you can take the following steps:
  
  
  Check Dates: Review the start and finish dates of the affected activities. Ensure that the finish date is not set to a future date when it should be zero or negative (indicating that the task is complete or not yet started).
  
  
  Review Dependencies: Examine the dependencies between tasks. Ensure that the predecessor and successor relationships are correctly defined and that they do not create a situation where a task's finish date is incorrectly calculated.
  
  
  Adjust Scheduling Parameters: If you are using scheduling parameters or settings, ensure they are configured correctly. This includes checking for any constraints that may be affecting the scheduling of tasks.
  
  
  Use the Project Planning Tools: Utilize SAP's project planning tools to visualize the project timeline and identify any discrepancies in the scheduling of tasks.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on handling scheduling errors in your version of SAP.
  
  
  Seek Help from SAP Support: If the issue persists, consider reaching out to SAP support or your internal SAP team for further assistance.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CJ20N (Project Builder) or CN41 (Network Overview) to analyze and manage project structures.
  SAP Notes: Check for any SAP Notes related to this error message, as they may provide additional insights or patches that address known issues.
  Training and Documentation: Ensure that users involved in project management are trained on proper scheduling practices within SAP to minimize the occurrence of such errors.
  
  By following these steps, you should be able to identify and correct the underlying issue causing the CN829 error in your SAP system.