How To Fix SY101 - Structure & changed (program &); start it again

SAP Error Message - Details

• Message type: E = Error

• Message class: SY - ABAP/4 system messages

• Message number: 101

• Message text: Structure & changed (program &); start it again

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 SY101 - Structure & changed (program &); start it again ?

  The SAP error message "SY101 Structure & changed (program &); start it again" typically occurs when there has been a change to the structure of a program or a data object while the program is still running. This can happen in various scenarios, such as when a developer modifies a data structure or program while users are still executing transactions that rely on that structure.
  Cause:
  
  Program Modification: The program or data structure has been modified after it was loaded into memory, which can happen if a developer makes changes to the ABAP code or data dictionary objects (like tables, views, or structures) while users are still using the program.
  Transport Requests: Changes that are transported from one system to another can also lead to this error if the program is running in the target system while the transport is being applied.
  Concurrent Users: Multiple users accessing the same program or transaction can lead to inconsistencies if one user modifies the program while others are still using it.
  
  Solution:
  
  Restart the Program: The simplest solution is to restart the program or transaction that triggered the error. This will reload the program with the latest changes.
  Check for Changes: If you are a developer or administrator, check if any changes were made to the program or related data structures. If changes were made, ensure that they are complete and consistent.
  Transport Management: If the error occurred after a transport, ensure that the transport was applied correctly and that all dependent objects are in sync.
  User Communication: Inform users to save their work and restart the transaction if they encounter this error. This will help avoid confusion and data loss.
  System Monitoring: Monitor the system for any ongoing changes or transports that might affect running programs. This can help prevent the error from occurring in the future.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific guidance or patches related to this error message. SAP frequently updates its knowledge base with solutions for common issues.
  ABAP Development: If you are a developer, ensure that you follow best practices for development, such as avoiding changes to programs that are currently in use.
  System Administration: System administrators should be aware of the impact of transports and changes on running programs and should plan maintenance windows accordingly.
  
  If the problem persists or if you need further assistance, consider reaching out to your SAP support team or consulting the SAP community for additional insights.