How To Fix MCEX161 - Change of update mode not possible due to queue entries -> Long text

SAP Error Message - Details

• Message type: E = Error

• Message class: MCEX - Extraction Interface LIS/BW

• Message number: 161

• Message text: Change of update mode not possible due to queue entries -> Long text

What causes this issue?

You are not allowed to change the update mode for application &V1& from
delta queued to another method, since there are V3 updates in one of
the queues &V2& that have not been processed.

How to fix this error?

Start queue processing via the "Job Control" function in the
Customizing cockpit. You can find an overview of delta updates that
have not been processed yet in the <DS:TRAN.LBWQ>Logistics Queue
Overview</>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MCEX161 - Change of update mode not possible due to queue entries -> Long text ?

  The SAP error message MCEX161 indicates that a change in the update mode is not possible because there are existing queue entries. This typically occurs in the context of the SAP system's data processing, particularly when dealing with the update modes for data extraction or data transfer processes.
  Cause:
  The error arises when you attempt to change the update mode (for example, from "Direct Update" to "Queued Update" or vice versa) while there are still entries in the update queue. This situation can occur if:
  
  There are pending or unprocessed entries in the update queue.
  The system is currently processing data, and changing the update mode would disrupt this process.
  There are inconsistencies or issues with the data that prevent the update mode from being changed.
  
  Solution:
  To resolve the MCEX161 error, you can follow these steps:
  
  
  Check the Update Queue:
  
  Use transaction codes like SMQ1 (for outbound queues) or SMQ2 (for inbound queues) to check for any entries in the update queue.
  Identify if there are any stuck or failed entries that need to be processed.
  
  
  
  Process or Delete Queue Entries:
  
  If there are entries that are pending, you may need to process them. This can involve reprocessing failed entries or ensuring that the data is correctly formatted and complete.
  If certain entries are no longer needed, you can delete them from the queue.
  
  
  
  Monitor Background Jobs:
  
  Check if there are any background jobs that are currently processing data related to the update mode. You can use transaction SM37 to monitor job statuses.
  
  
  
  Wait for Processing to Complete:
  
  If the system is actively processing data, you may need to wait until the current processing is complete before attempting to change the update mode again.
  
  
  
  Consult Logs:
  
  Review system logs for any additional error messages or warnings that might provide more context about the issue.
  
  
  
  System Restart:
  
  In some cases, a system restart may help clear any temporary issues, but this should be done with caution and typically as a last resort.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SMQ1 and SMQ2 for monitoring queues.
  SM37 for checking background job statuses.
  
  
  
  Documentation:
  
  Refer to SAP Help documentation for more details on update modes and queue management.
  
  
  
  SAP Notes:
  
  Check SAP Notes for any known issues or patches related to this error message.
  
  
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP Basis team or reach out to SAP support for further assistance.