How To Fix PSB_API_MSGCL134 - Duration cannot be changed if the calculation key is "Calculate Duration"

SAP Error Message - Details

• Message type: E = Error

• Message class: PSB_API_MSGCL -

• Message number: 134

• Message text: Duration cannot be changed if the calculation key is "Calculate Duration"

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message PSB_API_MSGCL134 - Duration cannot be changed if the calculation key is "Calculate Duration" ?

  The SAP error message PSB_API_MSGCL134 indicates that there is an issue with changing the duration of a project or task when the calculation key is set to "Calculate Duration." This typically occurs in the context of project management within SAP, particularly when using the Project System (PS) module.
  Cause:
  The error arises because the system is configured to automatically calculate the duration based on the start and finish dates of the project or task. When the calculation key is set to "Calculate Duration," the system expects the duration to be derived from these dates, and any manual changes to the duration are not allowed. This is a safeguard to ensure data integrity and consistency in project scheduling.
  Solution:
  To resolve this error, you have a couple of options:
  
  
  Change the Calculation Key:
  
  If you need to manually adjust the duration, you can change the calculation key from "Calculate Duration" to a different setting that allows manual input. This can typically be done in the project definition or task settings.
  Navigate to the project or task in question, and look for the settings related to duration calculation. Change the key to one that permits manual adjustments.
  
  
  
  Adjust Start/Finish Dates:
  
  If you want to keep the calculation key as "Calculate Duration," you can instead adjust the start or finish dates of the project or task. The system will then automatically recalculate the duration based on the new dates.
  
  
  
  Consult Documentation:
  
  Review the SAP documentation or help resources related to project management and duration calculations. This can provide additional insights into how to manage project durations effectively.
  
  
  
  Check User Authorizations:
  
  Ensure that you have the necessary authorizations to make changes to the project settings. Sometimes, restrictions can be due to user roles and permissions.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional context.
  Project Management Best Practices: Familiarize yourself with best practices in project management within SAP, especially regarding scheduling and duration management.
  Training and Support: If you continue to face issues, consider reaching out to your SAP support team or attending training sessions focused on the Project System module.
  
  By following these steps, you should be able to resolve the error and manage project durations effectively within SAP.