How To Fix CN640 - The assignment exists already

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 640

• Message text: The assignment exists already

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN640 - The assignment exists already ?

  The SAP error message CN640 ("The assignment exists already") typically occurs in the context of project management or cost center assignments in SAP. This error indicates that there is an attempt to create a duplicate assignment for a project, cost center, or internal order that already exists in the system.
  Cause:
  
  Duplicate Assignment: The most common cause is that the system is trying to assign a resource, cost center, or project to another entity (like a network or activity) that has already been assigned.
  Incorrect Data Entry: There may be a mistake in the data entry where the same assignment is being entered multiple times.
  System Configuration: Sometimes, the configuration settings in the project system or controlling area may lead to this error if they do not allow for multiple assignments.
  
  Solution:
  
  Check Existing Assignments: Review the existing assignments for the project, cost center, or internal order to confirm if the assignment already exists. You can do this by navigating to the relevant transaction (like CJ20N for project management) and checking the assignments.
  Modify or Remove Duplicate: If a duplicate assignment is found, you can either modify the existing assignment or remove it if it is no longer needed.
  Data Entry Validation: Ensure that data entry processes are validated to prevent duplicate entries. Implement checks or validations in the user interface to alert users before they create a duplicate assignment.
  Consult Documentation: Review SAP documentation or consult with your SAP support team to understand the specific configuration settings that might be causing this issue.
  Transaction Codes: Use relevant transaction codes (like CJ20N, CJ02, or CJI3) to navigate and manage project assignments effectively.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP Notes can provide additional context or solutions.
  User Authorization: Ensure that the user has the necessary authorizations to make changes to assignments, as lack of permissions can sometimes lead to unexpected errors.
  System Logs: Review system logs for any additional error messages or warnings that might provide more context about the issue.
  Training and Documentation: Ensure that users are trained on the correct procedures for entering assignments in SAP to minimize the risk of errors.
  
  If the issue persists after following these steps, it may be beneficial to reach out to your SAP support team for further assistance.