How To Fix CN591 - User &2 is creating a delivery for reservation &1

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 591

• Message text: User &2 is creating a delivery for reservation &1

What causes this issue?

For a delivery you have selected material components for reservation
&v1&. User &v2& is creating a delivery for the same reservation.

System Response

Processing is not continued

How to fix this error?

Try again when user &v2& has finished the transaction.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN591 - User &2 is creating a delivery for reservation &1 ?

  The SAP error message CN591 indicates that a user is attempting to create a delivery for a reservation that is already being processed by another user. This situation typically arises in environments where multiple users are working on the same reservations or deliveries simultaneously.
  Cause:
  The error occurs because:
  
  The reservation (identified by &1) is currently locked by another user (identified by &2) who is in the process of creating a delivery for that reservation.
  SAP has a locking mechanism to prevent data inconsistencies that can arise from concurrent modifications.
  
  Solution:
  To resolve this issue, you can take the following steps:
  
  
  Wait and Retry: The simplest solution is to wait for the other user to complete their transaction. Once they finish, the lock will be released, and you can attempt to create the delivery again.
  
  
  Identify the Lock: If you need to know who is holding the lock, you can use transaction code SM12 to view the lock entries. This will show you which user is currently working on the reservation.
  
  
  Communicate with the User: If possible, communicate with the user who is holding the lock to understand their progress and coordinate your actions.
  
  
  Check for Long-Running Transactions: If the user holding the lock is taking an unusually long time, check if they are stuck in a transaction. You can use transaction SM66 to monitor active processes in the system.
  
  
  Release the Lock (if necessary): If you determine that the lock is no longer needed (e.g., the user has left the session), you can manually delete the lock entry using transaction SM12. However, this should be done with caution and typically requires appropriate authorizations.
  
  
  Review System Configuration: If this issue occurs frequently, it may be worth reviewing the system configuration and user processes to minimize contention for the same reservations.
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM12: To view and manage lock entries.
  SM66: To monitor active processes in the system.
  
  
  
  Documentation: Refer to SAP Help documentation for more details on handling locks and reservations.
  
  
  User Training: Ensure that users are trained on how to manage reservations and deliveries to minimize conflicts.
  
  
  By following these steps, you should be able to resolve the CN591 error and continue with your delivery creation process.