How To Fix RSDMD156 - No master data update possible during a change run

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDMD - Messages for master data

• Message number: 156

• Message text: No master data update possible during a change run

What causes this issue?

You have tried to update master data. However, there is a realignment
run taking place at the moment, which is preventing this. This can
happen if a data request and a realignment run are scheduled in the
background and are run at the same time. The scheduler cannot predict
this behavior.

System Response

The update of master data (attributes or texts) is not executed.

How to fix this error?

After the realignment run has finished, the corresponding data packet
can be updated from the monitor.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RSDMD156 - No master data update possible during a change run ?

  The SAP error message RSDMD156, which states "No master data update possible during a change run," typically occurs in the context of SAP BW (Business Warehouse) when there is an attempt to update master data while a change run is in progress. This can happen during data loading processes or when master data is being modified.
  Cause:
  
  Change Run in Progress: The most common cause of this error is that a change run is currently active for the master data. A change run is a process that updates the master data in the InfoObject and is usually triggered by data loads or changes in the underlying data.
  Locking Mechanism: SAP BW uses a locking mechanism to prevent data inconsistencies. If a change run is active, it locks the master data, preventing any updates until the change run is completed.
  Data Load Issues: If there are issues with the data load process, such as errors in the data source or transformation, it may lead to this error.
  
  Solution:
  
  Wait for Change Run to Complete: The simplest solution is to wait for the current change run to finish. You can monitor the status of the change run in the SAP BW system.
  Check for Active Change Runs: Use transaction codes like RSA1 (Data Warehousing Workbench) to check if there are any active change runs. If you find one, you may need to wait or investigate why it is taking longer than expected.
  Restart the Process: If the change run seems to be stuck or taking too long, you may need to cancel it and restart the data load process. Be cautious with this approach, as it may lead to data inconsistencies if not handled properly.
  Review Data Load Logs: Check the logs for the data load process to identify any issues that may have caused the change run to hang or fail. This can provide insights into what went wrong and how to fix it.
  System Performance: Ensure that the system performance is optimal. Sometimes, performance issues can lead to longer processing times for change runs.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as RSA1 for data warehousing, RSD1 for InfoObject maintenance, and RSMO for monitoring data loads.
  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 SAP documentation on master data management and change runs to better understand the processes involved and best practices for managing them.
  
  By following these steps, you should be able to resolve the RSDMD156 error and ensure that master data updates can proceed without issues.