Mass assignment of "Employee Responsible" for Activites/Opportunities

Hi,

We would like to  to mass change of "Employee Responsible" for Activities (Appointments/Interaction Records) and Opportunities.Would be great if someone can provide the FM/BAPI that we can use for this usecase ?

I see BAPI 'BAPI_BUSPROCESSND_CHANGEMULTI' but not sure what table we need to fill to update "Employee Responsible"

Thanks & Regards, Anil