How To Fix CJ640 - You can only change the unit, if dates exist

CJ640 - Overview

• Message type: E = Error

• Message class: CJ - Project master data and structure

• Message number: 640

• Message text: You can only change the unit, if dates exist

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CJ640 - You can only change the unit, if dates exist ?

  The SAP error message CJ640 ("You can only change the unit, if dates exist") typically occurs in the context of project management and cost planning within the SAP system, particularly when dealing with project structures and their associated data.
  
  Cause:
  This error message is triggered when a user attempts to change the unit of measure for a project element (like a work package or activity) without having any date-related data (such as start or finish dates) already defined for that project element. SAP requires that certain conditions be met before allowing changes to the unit of measure, primarily to ensure data integrity and consistency in project planning.
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check Dates: Ensure that the project element you are trying to modify has valid start and finish dates. If these dates are missing, you will need to enter them first.
  
  
  Enter Dates:
  
  Navigate to the project element in question.
  Enter the