How To Fix 6D166 - Application &1 is currently blocked by &2

SAP Error Message - Details

• Message type: E = Error

• Message class: 6D - Real Estate Messages

• Message number: 166

• Message text: Application &1 is currently blocked by &2

What causes this issue?

The application is currently being processed by another user and the
relevant data is blocked.

System Response

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

How to fix this error?

Try to save the application later.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 6D166 - Application &1 is currently blocked by &2 ?

  The SAP error message 6D166 indicates that a specific application (denoted as &1) is currently blocked by another user or process (denoted as &2). This typically occurs in scenarios where multiple users or processes are trying to access or modify the same data or application simultaneously, leading to a lock situation.
  Cause:
  
  Locking Mechanism: SAP uses a locking mechanism to prevent data inconsistencies. When one user or process is working on a particular application or data set, it locks that resource to prevent others from making changes until the lock is released.
  Long-running Transactions: If a transaction takes too long to complete, it can hold locks for an extended period, causing other users to encounter this error.
  Deadlocks: In some cases, a deadlock situation may arise where two or more processes are waiting for each other to release locks, leading to this error.
  User Sessions: Sometimes, a user may have multiple sessions open, and one session may be blocking another.
  
  Solution:
  
  Identify the Blocking User/Process: Use transaction codes like SM12 (for lock entries) or SM21 (for system logs) to identify which user or process is holding the lock.
  Wait and Retry: If the blocking process is legitimate and expected to complete soon, you may need to wait and try again later.
  Terminate the Blocking Process: If the blocking process is not responding or is taking too long, you may need to terminate it. This can be done using transaction SM50 (for monitoring work processes) or SM66 (for monitoring all work processes in the system).
  Check for Long-running Transactions: Review the transactions that are taking a long time and optimize them if necessary.
  User Communication: If the blocking user is known, communicate with them to understand why the lock is in place and if they can release it.
  System Configuration: In some cases, adjusting the system configuration for lock timeouts or optimizing the application logic may help reduce the occurrence of such locks.
  
  Related Information:
  
  Transaction Codes:
  
  SM12: Display and manage lock entries.
  SM50: Monitor work processes.
  SM66: Monitor all work processes in the system.
  SM21: View system logs for errors and warnings.
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to locking mechanisms or specific applications.
  Performance Tuning: Regularly review and optimize long-running transactions to minimize locking issues.
  
  If the problem persists or if you are unsure about terminating processes, it is advisable to consult with your SAP Basis team or system administrator for further assistance.