How To Fix PROD_SUBSTN029 - The & field value changed while you were trying to modify it

SAP Error Message - Details

• Message type: E = Error

• Message class: PROD_SUBSTN - Messages for Product Substitution

• Message number: 029

• Message text: The & field value changed while you were trying to modify it

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message PROD_SUBSTN029 - The & field value changed while you were trying to modify it ?

  The SAP error message PROD_SUBSTN029 indicates that the value of a field you were trying to modify has changed during the process, which typically occurs in scenarios where multiple users or processes are trying to update the same data simultaneously. This can happen in various contexts, such as during the modification of production orders, material master data, or other transactional data.
  Cause:
  
  Concurrent Updates: Another user or process has modified the field value after you retrieved the data but before you attempted to save your changes.
  Data Locking: The system may have a locking mechanism that prevents changes to data that is currently being edited by another user.
  Background Jobs: Background jobs or batch processes may be updating the data while you are trying to make changes.
  
  Solution:
  
  Refresh the Data: Before making changes, refresh the data to ensure you have the most current values. This can often be done by reloading the screen or navigating away and back to the transaction.
  Check for Locks: If you suspect that another user is editing the same data, check for locks on the data. You can use transaction codes like SM12 to view and manage locks.
  Retry the Operation: After refreshing the data, try to make your changes again. Ensure that no other users are editing the same data at the same time.
  Communicate with Users: If you are in a multi-user environment, communicate with other users to coordinate changes to avoid conflicts.
  Review Background Jobs: If applicable, check if any background jobs are running that might be updating the same data.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12 (to check locks), SM21 (to view system logs), and SE11 (to view data dictionary).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. You can search the SAP Support Portal for specific notes that might address this issue.
  User Training: Ensure that users are trained on how to handle concurrent updates and the importance of refreshing data before making changes.
  
  If the problem persists after trying the above solutions, it may be necessary to consult with your SAP Basis or technical support team for further investigation.