Message type: E = Error
Message class:  XS - SAPconnect: All messages 
Message number: 104
Message text: A send process is already running for &1/prio &2
Only one send process can run for each address type and
send priority (high or normal) in one client. In this case, a
send process was started while another one was already running for this
address type and send priority. In this run, no messages will be sent
for this address type and send priority.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
No action required.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message XS104 indicates that a send process is already running for a specific destination and priority. This error typically occurs in the context of SAP's messaging or communication framework, such as when using the SAP Cloud Platform or SAP HANA XS (Extended Services).
Cause: The error occurs when: A send process (like a job or a task that sends messages or data) is already in progress for the specified destination (&1) and priority (&2). This can happen if a previous send process has not completed or has not been properly terminated, leading to a conflict when trying to initiate a new send process for the same destination and priority.
Solution: To resolve the XS104 error, you can take the following steps: Check Running Processes: Use transaction codes or tools to check for any running processes related to the send operation. You may need to look into the system logs or monitoring tools to identify if
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