Service Centre Management is for businesses that install, repair, or maintain equipment. A call becomes a job card. The job card names the customer, the asset, the technician, and the parts. When the visit is done, the invoice is not a separate story.
AMC schedules show what is due this week. Spare stock ties to the visit so a part used on site is a part that left the shelf. Shops that also sell across the counter can pair this with billing & ERP.