How To Fix BT123 - Target host or target server & is not defined in an operation type

SAP Error Message - Details

• Message type: E = Error

• Message class: BT - Background processing messages

• Message number: 123

• Message text: Target host or target server & is not defined in an operation type

What causes this issue?

The host system that you specified for the execution of your job is not
defined in the operation mode that is active when your job is started.
You have either specified that your job is to be started when a specific
operation mode becomes active, or that it is to be started on a specific
date and at a specific time.
The job can only be executed, if the host is active as an unconfigured
instance in the SAP system, if the background controller attempts to
start the job. An unconfigured instances must be started manually; it is
not started automatically as part of the operation mode.

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?

If possible, you should leave the host system field empty and save the
job again. The specification of a host system for the execution of a job
is only advisable if the job requires a resouce that is only available
on this host system. When you specify a host system, it also means that
the automatic load balancing mechanism of the background controller has
no effect.
If you need to specify a host system, you should use the
<DS:TRAN.RZ04>Computing Center Management Systems</> to determine when
the host that you require is active in the SAP system.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message BT123 - Target host or target server & is not defined in an operation type ?

  The SAP error message BT123, which states "Target host or target server & is not defined in an operation type," typically occurs in the context of Business Transaction Management (BTM) or when dealing with background jobs, particularly in scenarios involving remote function calls (RFC) or when configuring communication between different systems.
  Cause:
  
  Missing Configuration: The target host or server has not been defined in the operation type configuration. This can happen if the system was not properly set up or if the configuration was altered.
  Incorrect Operation Type: The operation type being used does not have the necessary target host or server defined.
  Transport Issues: If the system is trying to communicate with another system that is not properly configured or is down, this error can occur.
  Authorization Issues: Sometimes, the user may not have the necessary authorizations to access the target host or server.
  
  Solution:
  
  
  Check Configuration:
  
  Go to the transaction code related to the operation type configuration (e.g., SPRO for customizing).
  Navigate to the relevant section where operation types are defined and ensure that the target host or server is correctly specified.
  
  
  
  Define Target Host/Server:
  
  If the target host or server is not defined, you will need to add it. This typically involves specifying the hostname, port, and any other necessary parameters.
  
  
  
  Review Operation Type:
  
  Ensure that the operation type you are using is correctly set up to include the target host or server. You may need to create a new operation type if the existing one does not meet your requirements.
  
  
  
  Check RFC Connections:
  
  Use transaction SM59 to check the RFC connections. Ensure that the target system is reachable and that the connection is properly configured.
  
  
  
  Authorization Check:
  
  Verify that the user executing the operation has the necessary authorizations to access the target host or server.
  
  
  
  System Status:
  
  Ensure that the target system is up and running. If it is down, you will need to resolve any issues with that system.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SPRO: Customizing settings.
  SM59: RFC destination configuration.
  SM37: Job monitoring (to check if the job is failing due to this error).
  
  
  
  Documentation: Refer to SAP Help documentation for Business Transaction Management or the specific module you are working with for more detailed configuration steps.
  
  
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  
  
  By following these steps, you should be able to identify and resolve the issue causing the BT123 error message in your SAP system.