How To Fix ATO_CUSTOMER174 - Item cannot be changed because collection &1 is locked (&2).

SAP Error Message - Details

• Message type: E = Error

• Message class: ATO_CUSTOMER - ATO Messages for the End User

• Message number: 174

• Message text: Item cannot be changed because collection &1 is locked (&2).

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message ATO_CUSTOMER174 - Item cannot be changed because collection &1 is locked (&2). ?

  The SAP error message ATO_CUSTOMER174 indicates that an item cannot be changed because the associated collection is locked. This typically occurs in scenarios where a collection of items (such as a sales order, production order, or any other transactional data) is being processed or modified by another user or transaction, preventing concurrent changes.
  Cause:
  
  Locking Mechanism: SAP uses a locking mechanism to prevent data inconsistencies. If a user or process is currently editing or processing the collection, it will be locked for other users.
  Long-running Transactions: If a transaction takes a long time to complete, it can hold locks for an extended period, causing other users to encounter this error.
  Background Jobs: Sometimes, background jobs that are processing data can also lock collections, leading to this error for users trying to make changes.
  User Sessions: If a user has multiple sessions open and is working on the same collection, it can lead to locking issues.
  
  Solution:
  
  Wait and Retry: The simplest solution is to wait for a few moments and then try to make the change again. The lock may be released once the other transaction is completed.
  Identify the Lock: Use transaction code SM12 to check for locks. You can see which user or process is holding the lock on the collection. If necessary, you can contact the user or administrator to resolve the issue.
  Release Locks: If you have the necessary authorizations, you can manually release the lock from transaction SM12. However, be cautious with this approach, as it may lead to data inconsistencies if the other user is still processing the data.
  Check Background Jobs: Use transaction SM37 to check if there are any background jobs that might be locking the collection. If you find any, you may need to wait for them to complete or consult with the job owner.
  Review User Sessions: Ensure that you do not have multiple sessions open that might be causing the lock. Close unnecessary sessions.
  
  Related Information:
  
  Lock Management: Understanding how SAP handles locks can help in troubleshooting. Locks can be exclusive (preventing all other access) or shared (allowing read access).
  Transaction Codes: Familiarize yourself with transaction codes like SM12 (for lock entries), SM37 (for job monitoring), and SM21 (for system logs) to assist in troubleshooting.
  User Communication: If you are in a collaborative environment, communicate with your team members to ensure that no one else is working on the same collection simultaneously.
  
  If the issue persists after trying the above solutions, it may be necessary to consult with your SAP Basis team or technical support for further investigation.