How To Fix 6A739 - Program error: data change without lock (table "&1", key "&2")

SAP Error Message - Details

• Message type: E = Error

• Message class: 6A - Real estate messages rent adjustment

• Message number: 739

• Message text: Program error: data change without lock (table "&1", key "&2")

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message 6A739 - Program error: data change without lock (table "&1", key "&2") ?

  The SAP error message 6A739 indicates a program error related to data changes in a table without an appropriate lock. This typically occurs when multiple processes or users attempt to modify the same data simultaneously, leading to inconsistencies.
  Cause:
  
  Concurrent Updates: The error often arises when two or more transactions are trying to update the same record in a database table at the same time without proper locking mechanisms in place.
  Missing Locking Logic: The program may not have implemented the necessary locking logic (e.g., using ENQUEUE and DEQUEUE functions) to prevent concurrent modifications.
  Database Integrity Issues: It can also indicate a potential issue with database integrity, where the application logic does not properly handle the locking of records.
  
  Solution:
  
  Review Code: Check the ABAP code where the error occurs. Ensure that the program uses proper locking mechanisms (like ENQUEUE and DEQUEUE) before making changes to the database.
  Implement Locking: If the program is designed to handle concurrent updates, implement appropriate locking to prevent simultaneous access to the same data.
  Error Handling: Enhance error handling in the program to manage situations where a lock cannot be obtained, possibly by retrying the operation after a short delay.
  Transaction Management: Ensure that transactions are managed correctly, and that locks are released appropriately after the operation is completed.
  Check for Updates: If the error is occurring in standard SAP programs, check for any available SAP Notes or updates that may address this issue.
  
  Related Information:
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may provide additional insights or fixes related to this error.
  Transaction Codes: Use transaction codes like SM12 to monitor and manage locks in the system.
  Debugging: If you have access, use the ABAP debugger to trace the execution of the program and identify where the locking mechanism is failing.
  Performance Considerations: Be mindful of performance implications when implementing locking, as excessive locking can lead to performance bottlenecks.
  
  If the issue persists after implementing these solutions, consider reaching out to SAP support for further assistance.