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