How To Fix M8128 - System lock error: Inform system administrator

M8128 - Overview

• Message type: E = Error

• Message class: M8 - Invoice Verification/Valuation

• Message number: 128

• Message text: System lock error: Inform system administrator

What causes this issue?

A system error has occurred during blocking.

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?

Please inform your system administrator.

Error message extract from SAP system. Copyright SAP SE.

M8128 - Details

• The SAP error message M8128, which indicates a "System lock error: Inform system administrator," typically arises when there is an issue with the locking mechanism in the SAP system. This can occur during various operations, such as when trying to post a document or perform a transaction that requires exclusive access to certain data.
  Causes:
  
  Lock Table Issues: The lock table may be full or not functioning correctly, preventing new locks from being created.
  Long-Running Transactions: A transaction that holds a lock for an extended period can block other transactions from acquiring the necessary locks.
  Deadlocks: Two or more transactions may be waiting for each other to release locks, leading to a deadlock situation.
  Database Issues: Problems with the underlying database can also lead to locking issues.
  
  Configuration Issues: Incorrect configuration settings in the SAP system can lead to locking problems.
  
  Solutions:
  
  Check Lock Entries: Use transaction code SM12 to check for existing lock entries. You can delete