Why is it useful - because us (the dealer) & the customers will be able to see what department the machine was serviced on.
Who would benefit from it - us the dealer when reviewing invoices along with the customer. They call us all the time asking where the machine is located before they agree to pay the bill.
How should it work - Just add a line item for it. The Contract Invoices list the department of where the machine is located so it seems it would make sense for the service invoices to do the same.
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