Q: How do I restart the spool work process without restarting the SAP application?
A: You can use the transaction SM50. Choose the spool work process then select “proces → cancel without core”.
If you selected “restart after error → yes”, workprocess will be restarted and you will see the the error colon will get a red status.
Q: Can I switch other work processes to spool work processes without restarting the instance?
A: No. The internal structure of spool work processes is different from, for example, dialog work processes. Therefore, if you want to change the number of spool work processes, you must do this in the context of SAP profile maintenance (transaction RZ10) and then restart the instance.
SAP Basis Trick - Solution for your SAP Basis activity 