How To Fix SWF_XI_ADAPTER406 - An LUW is being processed in inbound queue &1 (SMQ2) for process type &2

SAP Error Message - Details

• Message type: E = Error

• Message class: SWF_XI_ADAPTER - XI BPM: Messages

• Message number: 406

• Message text: An LUW is being processed in inbound queue &1 (SMQ2) for process type &2

What causes this issue?

You want to change the settings for inbound processing for a process
type. This change is not permitted because the process-type-specific
queue is currently being executed.

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?

The short text of the error message specifies which queue cannot be
executed. Copy the queue name and call transaction SMQ2. Start the
selection using the copied queue name. The possibilities are as follows:
The queue does not exist
Try to make the settings again.
The queue exists
Create a stop entry in the queue, if it does not exist. Wait until no
more queue entries are being processed. Note that stopping the queue
does not affect the queue entry currently being processed; only the
subsequent entries are stopped.
When the queue is stopped, you should be able to change the setting for
the process type.
<ZH>Note the following:</> A non-existent queue may be seen as stopped
in the system, since inbound processing is locked while the settings are
being changed. Once a queue entry exists, the administrator must create
a stop entry for the corresponding queue. If, in the first case, the
system still refuses the change, this is probably because the queue
became existent or still existed in the meantime. Since new queue
entries are constantly being added, you must only change the settings
for inbound processing when the system load is low. You may have to make
several attempts to stop the queue in SMQ2 and change the setting.

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 SWF_XI_ADAPTER406 - An LUW is being processed in inbound queue &1 (SMQ2) for process type &2 ?

  The SAP error message SWF_XI_ADAPTER406 indicates that there is a problem with the processing of a Logical Unit of Work (LUW) in the inbound queue (SMQ2) for a specific process type. This error typically occurs in the context of SAP's integration with other systems, particularly when using the SAP Exchange Infrastructure (XI) or Process Integration (PI).
  Cause:
  
  
  Message Processing Delay: The error usually arises when a message is stuck in the inbound queue (SMQ2) and is not being processed. This can happen due to various reasons, such as:
  
  The target system is down or unreachable.
  There are issues with the configuration of the communication channel.
  The message processing logic in the integration flow is encountering errors.
  Resource constraints (e.g., memory, CPU) on the SAP system.
  
  
  
  Locking Issues: If a message is being processed and another attempt is made to process the same message, it can lead to this error.
  
  
  Configuration Errors: Incorrect settings in the process type or communication channel can also lead to this error.
  
  
  Solution:
  
  
  Check the Inbound Queue (SMQ2):
  
  Go to transaction code SMQ2 and check the status of the messages in the queue.
  Identify the specific message that is causing the issue and analyze its details.
  
  
  
  Monitor the Target System:
  
  Ensure that the target system is up and running and that there are no connectivity issues.
  Check if the target system is able to process incoming messages.
  
  
  
  Review Communication Channel Configuration:
  
  Verify the configuration of the communication channel associated with the process type.
  Ensure that the settings (e.g., endpoint URL, authentication) are correct.
  
  
  
  Check for Errors in the Integration Flow:
  
  Review the integration flow (iFlow) for any errors or exceptions that may be causing the message to fail.
  Check the logs for any error messages that can provide more context.
  
  
  
  Clear the Queue:
  
  If the message is stuck and cannot be processed, you may need to delete or reprocess the message from the queue.
  Use the appropriate options in SMQ2 to handle the message (e.g., reprocess, delete).
  
  
  
  System Resources:
  
  Monitor system resources to ensure that there are no bottlenecks affecting message processing.
  If necessary, optimize the system performance.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SMQ1: Outbound Queue
  SMQ2: Inbound Queue
  SXMB_MONI: Integration Engine Monitoring
  SXI_MONITOR: PI Monitoring
  
  
  
  Logs and Traces:
  
  Check the application logs (transaction SLG1) for any related error messages.
  Use transaction ST22 to check for dumps that may provide additional insights.
  
  
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to this error message.
  
  
  By following these steps, you should be able to diagnose and resolve the issue related to the SWF_XI_ADAPTER406 error message.