How To Fix PAB028 - Data cannot be blocked (system error)

SAP Error Message - Details

• Message type: E = Error

• Message class: PAB - JIT calls

• Message number: 028

• Message text: Data cannot be blocked (system error)

What causes this issue?

In trying to lock an object for processing, an internal error was
detected in the SAP lock management.

System Response

The SAP system cannot enter the selected lock in the so-called lock
table administered by the ENQUEUE server. Therefore the ENQUEUE
function module sets an exception.

How to fix this error?

The most common reason for the existing error message is that the
ENQUEUE server can no longer be used. The cause for this can be that
either the ENQUEUE server itself or the message server, which forms the
link between application servers and ENQUEUE servers, is no longer
running.
Enquire about the appropriate servers in your system administration.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message PAB028 - Data cannot be blocked (system error) ?

  The SAP error message PAB028, which states "Data cannot be blocked (system error)," typically indicates that there is an issue with the system that is preventing the blocking of data in the context of a particular transaction or process. This error can occur in various scenarios, such as during the processing of documents, data entry, or when trying to lock records for editing.
  Possible Causes:
  
  Database Lock Issues: The system may be experiencing issues with database locks, which can prevent data from being blocked.
  System Configuration: There may be configuration issues in the SAP system that are causing the error.
  Transaction Errors: The specific transaction being executed may have errors or inconsistencies that lead to this message.
  User Authorizations: The user may not have the necessary authorizations to perform the action that is being attempted.
  Technical Issues: There could be underlying technical issues, such as problems with the application server or database server.
  
  Solutions:
  
  Check System Logs: Review the system logs (transaction SM21) for any related error messages that could provide more context about the issue.
  Database Lock Overview: Use transaction SM12 to check for any existing locks on the database that may be causing the issue. If there are unnecessary locks, they can be released.
  Review Authorizations: Ensure that the user has the necessary authorizations to perform the action. This can be checked using transaction SU53 or by consulting with your security team.
  Transaction Consistency: Verify that the transaction being executed is consistent and that all required data is available and correct.
  System Configuration: Check the configuration settings related to the specific module or transaction to ensure they are set up correctly.
  Restart Services: If the issue persists, consider restarting the relevant application or database services, as this can sometimes resolve temporary glitches.
  Contact SAP Support: If none of the above solutions work, it may be necessary to contact SAP support for further assistance, especially if the issue is related to a bug or a deeper system problem.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM21 (System Log), SM12 (Lock Entries), SU53 (Authorization Check), and ST22 (Dump Analysis) for troubleshooting.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error message or provide patches or updates.
  Documentation: Review SAP documentation related to the specific module or functionality you are working with to understand any specific requirements or limitations.
  
  By following these steps, you should be able to diagnose and potentially resolve the PAB028 error in your SAP system.