How To Fix /PLMU/UI_GSS028 - Synchronization unit &1 is locked and cannot be synchronized

SAP Error Message - Details

• Message type: E = Error

• Message class: /PLMU/UI_GSS -

• Message number: 028

• Message text: Synchronization unit &1 is locked and cannot be synchronized

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /PLMU/UI_GSS028 - Synchronization unit &1 is locked and cannot be synchronized ?

  The SAP error message /PLMU/UI_GSS028 Synchronization unit &1 is locked and cannot be synchronized typically indicates that a synchronization unit (which could be a business object, data set, or similar entity) is currently locked by another process or user, preventing the current operation from proceeding.
  
  Cause:
  
  Concurrent Access: Another user or process is currently accessing or modifying the synchronization unit, leading to a lock.
  Long-Running Transactions: A transaction that takes a long time to complete may hold a lock on the synchronization unit.
  System Configuration: Certain configurations or settings in the SAP system may lead to locking behavior.
  Deadlocks: In some cases, a deadlock situation may occur where two or more processes are waiting for each other to release locks.
  
  
  Solution:
  
  Wait and Retry: If the lock is temporary, waiting for a few moments and then retrying the operation may resolve the issue.
  Identify the Lock: Use transaction codes like SM12 (to view and manage locks) to identify