./<TWS_home>/methods/r3batch -t PL -c Workstation_name -l "*" -j "*" -- "-debug"
Also additional details can be found in /TWS_home/methods/trace-r3batch.log if you add, for the problematic SAP jobs, "-trace" option.
Hint: To run SAP jobs using TWS you need TWS for Applications to be deployed, which can be installed directly on the TWS master or on on any FTA agent.