How To Fix SWN161 - Optimized delta mechanism must not be activated

SAP Error Message - Details

• Message type: E = Error

• Message class: SWN - WF Notif: Messages

• Message number: 161

• Message text: Optimized delta mechanism must not be activated

What causes this issue?

The system does not meet the prerequisites for the optimized delta
mechanism for the Universal Worklist and Duet.
The optimized delta mechanism for UWL and Duet has the following
prerequisites:
Index 002 of table SWN_NOT
The conversion program RSWN_SET_RECIPIENT_HASH2 has run successfully.
The RECIPIENT_HASH2 column is filled for all lines of table SWN_NOTIF.
If these prerequisites are not met, you cannot activate the optimized
delta mechanism, because the UWL and Duet can no longer be supplied with
data (work items).

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

For more information, see SAP Note 1459177.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SWN161 - Optimized delta mechanism must not be activated ?

  The SAP error message SWN161 indicates that the "Optimized delta mechanism must not be activated" for the SAP Workflow Notification (SWN) service. This error typically arises when there is a configuration issue related to the notification settings in the SAP system.
  Cause:
  The error occurs when the optimized delta mechanism is enabled in the SAP system, but it is not supported or required for the specific configuration of the workflow notifications. This can happen due to:
  
  Incorrect Configuration: The settings for the workflow notifications may not be compatible with the optimized delta mechanism.
  Version Compatibility: The version of the SAP system or the components involved may not support the optimized delta mechanism.
  Missing Parameters: Required parameters for the notification settings may not be properly set.
  
  Solution:
  To resolve the SWN161 error, you can follow these steps:
  
  
  Check Configuration:
  
  Go to transaction code SWN1 (Workflow Notification) and check the settings.
  Ensure that the "Optimized delta mechanism" is disabled if it is not needed for your configuration.
  
  
  
  Adjust Settings:
  
  If you find that the optimized delta mechanism is enabled, you can disable it by navigating to the relevant configuration settings in the SAP system.
  You may need to adjust the settings in the SWNCONFIG transaction or related configuration areas.
  
  
  
  Review Documentation:
  
  Check the SAP documentation for your specific version to understand the requirements and limitations regarding the optimized delta mechanism.
  
  
  
  Consult SAP Notes:
  
  Look for relevant SAP Notes that may address this specific error. SAP Notes often provide patches or additional configuration steps that can resolve known issues.
  
  
  
  Testing:
  
  After making changes, test the workflow notifications to ensure that they are functioning correctly without the error.
  
  
  
  Seek Support:
  
  If the issue persists, consider reaching out to SAP support or your internal SAP Basis team for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  SWN1: Workflow Notification Configuration
  SWNCONFIG: Configuration for Workflow Notifications
  
  
  SAP Notes: Search for specific SAP Notes related to SWN161 for additional guidance and updates.
  Documentation: Review the SAP Help Portal for detailed information on workflow notifications and delta mechanisms.
  
  By following these steps, you should be able to resolve the SWN161 error and ensure that your workflow notifications are configured correctly.