You can use transaction code swus_with_reference. By using this tcode you can retrigger workflow with enterinf workflow id for a spesific user. Also you can open debugger mode with selecting ‘2 Asynchoronous Execution Using aRFC‘.
If you can’t use “/h”, you can open debug mode by creating a txt file. Firstly, open a txt file and write the codes below in. [FUNCTION] Command=/H Title=Debugger Type=SystemCommand Save txt file and exit. Drag txt file and drop on pop up screen. Debegger mode is now switched on.