How To Fix SODQ018 - Exclusive TSN not received because object &2 is locked by user &1

SAP Error Message - Details

• Message type: E = Error

• Message class: SODQ - Operational Delta Queue

• Message number: 018

• Message text: Exclusive TSN not received because object &2 is locked by user &1

What causes this issue?

This application has requested an exclusive TSN (Transaction Sequence
Number) but the TSN has not been received. The system tried for &V4&
seconds to lock object &V2& exclusively. However, table &V3& was locked
by user &V1& in a different SAP transaction.

System Response

Once the maximum waiting time of &V4& seconds has expired, the system
will stop trying to lock object &V2& exclusively.

How to fix this error?

Procedure for System Administrators

In the lock table (Tools > Administration ==> Monitor -> Lock Entries or
Transaction SM12), check which work process has locked object &V2& and
how long the object has been locked. Check if the process that set the
lock is still active. For example, an application process that writes to
the delta queue might have set a read lock. Then the process terminates
with a core dump, without deleting the lock. In this case, you can
delete the lock entry from the lock table manually.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SODQ018 - Exclusive TSN not received because object &2 is locked by user &1 ?

  The SAP error message SODQ018 indicates that a transaction or object is locked by a user, preventing the current user from accessing or modifying it. This typically occurs in scenarios where multiple users or processes are trying to access the same object simultaneously, leading to a lock situation.
  Cause:
  The error message "Exclusive TSN not received because object &2 is locked by user &1" is caused by:
  
  Locking Mechanism: SAP uses a locking mechanism to ensure data integrity. When a user or process locks an object (like a transaction, table, or document), other users trying to access that object will receive this error message.
  Concurrent Access: If multiple users or processes are trying to access the same object at the same time, the first one to lock it will prevent others from accessing it until the lock is released.
  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.
  
  Solution:
  To resolve the SODQ018 error, you can take the following steps:
  
  
  Identify the Lock:
  
  Use transaction code SM12 to view the list of locks in the system. You can filter by the object name (object &2) or the user (user &1) to find the specific lock.
  Check who is holding the lock and what object is locked.
  
  
  
  Communicate with the User:
  
  If the lock is held by another user, communicate with them to understand if they can release the lock. They may need to complete their transaction or log off to release the lock.
  
  
  
  Release the Lock:
  
  If necessary and if you have the appropriate authorizations, you can manually delete the lock entry in transaction SM12. However, this should be done with caution, as it may lead to data inconsistencies if the user is in the middle of a transaction.
  
  
  
  Review Transaction Design:
  
  If this error occurs frequently, consider reviewing the design of the transactions or processes that are causing the locks. Optimizing the transaction flow or reducing the time locks are held can help minimize these issues.
  
  
  
  Monitor System Performance:
  
  Regularly monitor system performance and user activity to identify patterns that lead to locking issues. This can help in proactive management of locks.
  
  
  
  Related Information:
  
  Lock Types: Understand the difference between exclusive locks (which prevent all other access) and shared locks (which allow other users to read but not modify).
  Transaction Codes: Familiarize yourself with relevant transaction codes such as:
  
  SM12: Display and manage locks.
  SM21: System log for monitoring system events.
  ST22: Dump analysis for checking system errors.
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to locking mechanisms or specific transactions that may be causing frequent locks.
  
  By following these steps, you should be able to resolve the SODQ018 error and minimize its occurrence in the future.