How To Fix RSDS129 - Data structures were changed. Start transaction beforehand

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDS - New DataSource

• Message number: 129

• Message text: Data structures were changed. Start transaction beforehand

What causes this issue?

The generated data structure and the generated access program were
changed since they were last used. Only the old references are stored in
the program buffer.

System Response

You can only use the generated code (and the preview function) when the
transaction is restarted. When you restart the transaction, current
sources are loaded.

How to fix this error?

Restart the transaction.

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 RSDS129 - Data structures were changed. Start transaction beforehand ?

  The SAP error message RSDS129 indicates that there have been changes made to the data structures of the InfoProvider or the underlying data source, which can affect the data extraction process. This error typically occurs in the context of SAP BW (Business Warehouse) when you are trying to execute a data extraction or reporting process.
  Cause:
  
  Changes in Data Structures: The most common cause of this error is that the data structure of the InfoProvider (like an InfoCube, DataStore Object, or InfoObject) has been modified. This could include changes such as adding or removing fields, changing data types, or modifying key figures.
  Inconsistent Metadata: If the metadata in the BW system is not in sync with the underlying data source (like an SAP ERP system), it can lead to this error.
  Transport Issues: If changes were transported from a development environment to a production environment without proper adjustments, it could lead to inconsistencies.
  
  Solution:
  
  Restart the Transaction: The immediate solution is to restart the transaction that triggered the error. This often resolves temporary inconsistencies.
  Check for Changes: Review the change logs or documentation to identify what changes were made to the data structures. If you have access, check the InfoProvider and its associated data sources for any modifications.
  Activate the InfoProvider: If changes were made to the InfoProvider, ensure that it is activated. You can do this by navigating to the InfoProvider in the Data Warehousing Workbench and activating it.
  Rebuild the DataSource: If the error persists, consider rebuilding the DataSource. This can be done by going to the DataSource in the Data Warehousing Workbench and selecting the option to rebuild it.
  Check for Transport Issues: If the changes were transported, ensure that all related objects were transported correctly and that there are no missing dependencies.
  Run the Data Load Again: After making the necessary adjustments, try running the data load or report again to see if the issue is resolved.
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like RSA1 (Data Warehousing Workbench) to access InfoProviders and DataSources.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions for common problems.
  Documentation: Review the SAP BW documentation for best practices on managing InfoProviders and DataSources, especially when making structural changes.
  
  If the problem persists after trying the above solutions, it may be beneficial to consult with your SAP Basis or BW team for further investigation, as they may have additional tools or insights into the specific configuration of your SAP environment.